1 i-80/gilman street interchange improvement …...apr 25, 2016 · 6-7 pm 492 6-7 pm 626 6-7 pm...

INTERCHANGE IMPROVEMENT PROJECT

I-80/GILMAN STREET INTERCHANGEIMPROVEMENT PROJECT

WELCOMETO THE

OPEN HOUSE!

1


PROJECT BACKGROUND2

Over the years, the City of Berkeley has completed numerous studies to identify the improvement needs for Gilman Street in the vicinity of the I-80 interchange.

West Berkeley Parking and Circulation Study (1998) Analyzed parking and circulation deficiencies in the area bounded by Cedar Street, Sixth Street, University Avenue and Eastshore Highway.

Recommendation: Outline possible solutions to improve traffic flow at the Eastshore Highway and West Frontage Road in the interchange area.

»A combination of freeway congestion, inefficient roadway geometries, increased rail traffic and changes in land use contribute to the heavy traffic congestion in the project area.

»The Union Pacific railroad track crosses Gilman Street at 3rd Street, two blocks from the I-80/Gilman Street ramp intersections. The increase in rail traffic impedes local traffic circulation, and causes delays at the Gilman Street and 3rd Street at-grade crossing.

»The city’s development in recent years has generated additional traffic accessing the I-80 freeway through Gilman Street.

»The existing five-leg and six-leg stop-controlled intersections at the interchange cannot efficiently clear the traffic movements, resulting in substantial delay in the project area.

Gilman Street Interchange Improvement Study (2005) Further analyzed the roadway circulation and provided recommendations for interchange reconfiguration.

Findings: A dual roundabout design with a connecting segment between the I-80/Gilman Street intersections would provide the most benefit and was considered the most viable alternative to improve traffic flow while meeting safety, accessibility and mobility needs.

Draft Project Study Report (PSR) (2005)Suggested that the dual roundabout design was the most viable solution to achieve acceptable levels of service without any modifications to freeway structures.

Recommendation: Conduct additional analyses to address the operational issues.

West Berkeley Circulation Master Plan Report (2009) The City of Berkeley issued the Master Plan for the west Berkeley area including the I-80/Gilman Street interchange’s operating conditions, including bicycle and pedestrian travel.

Findings:

» Gilman Street interchange is an area of concern

» The Gilman Street interchange and adjacent frontage roads experienced congestion and delay during all periods of the day and all days of the week.

» The at-grade rail crossing near the interchange also added to vehicle queuing when rail activity blocked the roadway.

Project Study Report-Project Development Support (PSR-PDS) (2014)This study evaluated four alternatives including a no-build alternative.

Findings: Alternative 3, a double roundabout with by-pass lanes, is the only alternative that will provide acceptable level of service for the design year (2040).

Previous Studies

Background


PROJECT PURPOSE AND NEED 3

The purpose of the proposed project is to:

I-80 is a 10-lane freeway that extends through the Berkeley/Gilman Street area. Gilman Street is classified as a major arterial with a posted speed limit of 25 miles per hour and is designated as a truck route. Vehicular traffic on Gilman Street is comprised of commuter, local and commercial truck traffic. Traffic controls along Gilman Street include pavement markings, with turn channelization at the 6th, 8th, and 9th Street intersections only.

The I-80/Gilman Street Interchange is a four-lane arterial roadway (Gilman Street), with two lanes in the east/west direction that are intersected with four I-80 on- and off-ramps, an existing frontage road, and Eastshore Highway. Traffic controls on all approaches to Gilman Street consist of stop signs and pavement markings.

These conditions, along with an overall increase in vehicle traffic, have created the need to address the poor and confusing operations in the interchange area.

In addition, other needs related to modal interrelationships and social considerations have been identified, including closing the gap in the Gilman Street and regional San Francisco Bay Trail bikeway system in the area, and providing safe pedestrian and bicycle access to and from the project study area.

Simplify and improve the navigation, mobility, and traffic operations at the I-80/Gilman Street Interchange.

Reduce congestion, vehicle queues and conflicts at the I-80/Gilman Street Interchange.

Improve local and regional bicycle connections and pedestrian facilities through the I-80/Gilman Street interchange.

Improve safety for all modes of transportation.

Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AEX, Getmapping, Aerogrid, IGN, IGP, swisstopo, and the GIS User Community

[ 0 100 200 30050Feet

Project Purpose

Project Need

0 80 160 320FEET

0 80 160 320FEET


TRAFFIC CONDITIONS4a

ADT SUMMARY

AM PEAK PERIOD (5:00-10:00 A.M.) (MIXED FLOW + HOV) PM PEAK PERIOD (3:00-7:00 P.M.) (MIXED FLOW + HOV)

HOURLY VOLUMES AT GILMAN STREET (BETWEEN I-80 RAMPS)

ADT COUNTS, WEDNESDAY, 1/27/2016

Page 6

ADT COUNTS

Seven-day, 24-hour classification counts were collected at three locations along Gilman Street:

• Gilman Street, between I-80 ramps • Gilman Street, between Second Street and Fourth Street • Gilman Street, between Seventh Street and Eighth Street

Data were collected using tubes in 15-minute intervals. The detailed data are attached in Appendix A. The collected data are summarized into average daily traffic (ADT), as listed in Table 2. ADT volumes along the Gilman Street varied between approximately 15,000 vehicles to 20,000 vehicles at the above three locations.

Table 2: ADT Summary

Figure 4 shows a sample plot of hourly volumes at Gilman Street between I-80 ramps on Wednesday, January 27, 2016. At this location, the WB direction peaks between 7:00-9:00 a.m., and the EB direction peaks between 3:00-7:00 p.m.

Figure 4: Hourly Volumes at Gilman Street (between I-80 Ramps)

EB WB EB WB EB WB1/22/2016 Friday 9,851 6,889 16,740 8,687 11,194 19,881 7,757 8,148 15,9051/23/2016 Saturday 8,024 6,153 14,177 8,833 10,198 19,031 7,852 7,856 15,7081/24/2016 Sunday 7,083 5,890 12,973 8,239 8,786 17,025 7,066 6,884 13,9501/25/2016 Monday 9,066 7,487 16,553 8,412 10,313 18,725 7,204 7,601 14,8051/26/2016 Tuesday 9,386 7,536 16,922 8,328 11,044 19,372 7,164 7,920 15,0841/27/2016 Wednesday 9,676 7,516 17,192 8,447 11,452 19,899 7,441 7,967 15,4081/28/2016 Thursday 9,567 7,740 17,307 8,566 10,949 19,515 7,425 7,964 15,389

8,950 7,030 15,981 8,502 10,562 19,064 7,416 7,763 15,178Average

B. Gilman St (Between Second St and Fourth St)Volume (Vehicles)

Total

C. Gilman St (Between Seventh St and Eighth St)Volume (Vehicles)

TotalDate DayVolume (Vehicles)

A. Gilman St (Between I-80 Ramps)

Total

Central Ave On-Ramp Central Ave Off-Ramp Off to I-580 WB Buchanan St Off-Ramp Gilman St Off-Ramp University Ave On-Ramp5-6 AM 87 5-6 AM 58 5-6 AM 1,078 5-6 AM 51 5-6 AM 160 5-6 AM 95 6-7 AM 146 6-7 AM 100 6-7 AM 1,856 6-7 AM 129 6-7 AM 212 6-7 AM 186 7-8 AM 322 7-8 AM 234 7-8 AM 2,897 7-8 AM 400 7-8 AM 318 7-8 AM 467 8-9 AM 364 8-9 AM 322 8-9 AM 3,150 8-9 AM 450 8-9 AM 339 8-9 AM 620 University Ave Off-Ramp9-10 AM 315 9-10 AM 361 9-10 AM 2,745 9-10 AM 476 9-10 AM 383 9-10 AM 465 5-6 AM 228

6-7 AM 519 Buchanan St On-Ramp Gilman St On-Ramp 7-8 AM 887 5-6 AM 26 5-6 AM 91 8-9 AM 1,214 6-7 AM 67 6-7 AM 149 9-10 AM 1,068

Central Ave Mainline 7-8 AM 230 7-8 AM 259 University Ave Mainline5-6 AM 1,094 8-9 AM 338 8-9 AM 397 5-6 AM 2,353 6-7 AM 2,099 9-10 AM 229 9-10 AM 441 6-7 AM 4,395 7-8 AM 3,566 7-8 AM 6,695 8-9 AM 3,806 8-9 AM 6,743 9-10 AM 3,871 9-10 AM 6,533

University Ave MainlineCentral Ave Off-Ramp Central Ave Mainline Gilman St Off-Ramp 5-6 AM 5,980 University Ave On-Ramp5-6 AM 191 5-6 AM 4,921 5-6 AM 240 6-7 AM 9,386 5-6 AM 277 6-7 AM 261 6-7 AM 7,095 6-7 AM 492 7-8 AM 9,051 6-7 AM 472 7-8 AM 449 7-8 AM 6,284 7-8 AM 1,081 8-9 AM 8,023 7-8 AM 619 8-9 AM 514 8-9 AM 5,093 8-9 AM 1,303 9-10 AM 7,612 8-9 AM 658 9-10 AM 498 9-10 AM 4,977 9-10 AM 1,194 9-10 AM 513

Central Ave On-Ramp Cleveland Ave Off-Ramp On from I-580 EB Buchanan St On-Ramp Gilman St On-Ramp University Ave Off-Ramp5-6 AM 132 5-6 AM 67 5-6 AM 1,192 5-6 AM 141 5-6 AM 141 5-6 AM 258 6-7 AM 229 6-7 AM 155 6-7 AM 1,940 6-7 AM 318 6-7 AM 233 6-7 AM 510 7-8 AM 276 7-8 AM 343 7-8 AM 2,774 7-8 AM 754 7-8 AM 454 7-8 AM 667 8-9 AM 320 8-9 AM 264 8-9 AM 2,803 8-9 AM 921 8-9 AM 510 8-9 AM 718 9-10 AM 310 9-10 AM 297 9-10 AM 2,506 9-10 AM 559 9-10 AM 419 9-10 AM 661

I-580

Cleveland Ave

I-580

Univ

ersi

ty A

ve

Gilm

an S

t

Buch

anan

St

Cent

ral A

ve

I-80 EB I-80 EB

I-80 WB I-80 WB

N

Page 10

Figure 6: Freeway and Ramp Counts – PM Peak Period (3:00-7:00 p.m.) (Mixed flow + HOV)

Central Ave On-Ramp Central Ave Off-Ramp Off to I-580 WB Buchanan St Off-Ramp Gilman St Off-Ramp University Ave On-Ramp3-4 PM 583 3-4 PM 479 3-4 PM 2,979 3-4 PM 499 3-4 PM 289 3-4 PM 1,004 4-5 PM 507 4-5 PM 541 4-5 PM 3,454 4-5 PM 466 4-5 PM 215 4-5 PM 1,000 5-6 PM 507 5-6 PM 626 5-6 PM 3,792 5-6 PM 512 5-6 PM 229 5-6 PM 1,285 6-7 PM 492 6-7 PM 626 6-7 PM 3,071 6-7 PM 608 6-7 PM 265 6-7 PM 1,058 University Ave Off-Ramp7-8 PM 563 7-8 PM 544 7-8 PM 2,066 7-8 PM 616 7-8 PM 324 7-8 PM 723 3-4 PM 679

4-5 PM 580 Buchanan St On-Ramp Gilman St On-Ramp 5-6 PM 587 3-4 PM 355 3-4 PM 928 6-7 PM 713 4-5 PM 372 4-5 PM 1,120 7-8 PM 826

Central Ave Mainline 5-6 PM 323 5-6 PM 1,129 University Ave Mainline3-4 PM 5,514 6-7 PM 332 6-7 PM 859 3-4 PM 8,313 4-5 PM 5,477 7-8 PM 265 7-8 PM 522 4-5 PM 8,022 5-6 PM 5,314 5-6 PM 7,780 6-7 PM 5,283 6-7 PM 7,831 7-8 PM 5,716 7-8 PM 7,785

University Ave MainlineCentral Ave Off-Ramp Central Ave Mainline Gilman St Off-Ramp 3-4 PM 6,435 University Ave On-Ramp3-4 PM 504 3-4 PM 4,349 3-4 PM 879 4-5 PM 6,536 3-4 PM 644 4-5 PM 501 4-5 PM 4,178 4-5 PM 1,090 5-6 PM 5,866 4-5 PM 691 5-6 PM 516 5-6 PM 3,946 5-6 PM 738 6-7 PM 6,042 5-6 PM 798 6-7 PM 492 6-7 PM 3,716 6-7 PM 551 7-8 PM 5,623 6-7 PM 798 7-8 PM 344 7-8 PM 2,990 7-8 PM 449 7-8 PM 652

Central Ave On-Ramp Cleveland Ave Off-Ramp On from I-580 EB Buchanan St On-Ramp Gilman St On-Ramp University Ave Off-Ramp3-4 PM 328 3-4 PM 320 3-4 PM 2,789 3-4 PM 454 3-4 PM 333 3-4 PM 563 4-5 PM 286 4-5 PM 344 4-5 PM 3,288 4-5 PM 497 4-5 PM 299 4-5 PM 540 5-6 PM 265 5-6 PM 376 5-6 PM 3,477 5-6 PM 430 5-6 PM 257 5-6 PM 677 6-7 PM 281 6-7 PM 329 6-7 PM 2,968 6-7 PM 362 6-7 PM 279 6-7 PM 787 7-8 PM 273 7-8 PM 181 7-8 PM 2,045 7-8 PM 350 7-8 PM 248 7-8 PM 948

I-580

Cleveland Ave

I-580

Univ

ersi

ty A

ve

Gilm

an S

t

Buch

anan

St

Cent

ral A

ve

I-80 EB I-80 EB

I-80 WB I-80 WB

N

Gilman St.Harrison St.

Page St.

Jones St.

Camelia St.

2nd St.

4th St.

5th St.

6th St.

7th St.

8th St.

9th St.

10th St.

Gilman St.

Eastshore Hw

y.W

Frontage Rd.

80

123

Figure 1

N

1 23 4

5

6

7

89

1011

1213

Kains Ave.

Page St.

Jones St.

San Pablo Ave.

Study IntersectionRailroad Track

Vicinity Map

W. Frontage Rd./Gilman St.

I-80 WB Off - Ramp/Gilman St.

I-80 EB Off - Ramp/Gilman St.

Existing Conditions Lane Geometry, Controls & Turning Movement Volumes

Figure 2

N

LEGEND

AM Peak Hour VolumesPM Peak Hour Volumes

XX(XX)

2 (4

)0

(4)

6 (1

1)

694

(235

)21

9 (3

)40

2 (3

04)

9 (10)110 (117)951 (256)

8 (1

2)0

(0)

41 (4

52)

4 (1)15 (172)

6 (21)

378 (152)231(193)

47 (629)9 (15)

353(856)733 (398)

30 (1

2)0

(7)

342

(115

)

47 (517)578 (431)

335

(83)

126

(13)

48 (1

9)

24(104)711 (975)10 (5)

38 (1

31)

2 (4

5)24

(46)

27 (77)621 (434)

285 (78)

25 (10)724 (1,073)

9 (1

1)0(

2)

29 (25)638 (472)

8 (5)

Gilman St. W. F

ront

age

Rd.

Gilman St. I-80

WB

Off

- Ram

p

Gilman St.

I-80

EB

Off

- Ram

p

Gilman St. Eas

tsho

re H

wy.

2 nd

St.

Gilman St.

Gilman

Harrison St.

Camelia St.

2nd St.

4th St.

5th St.

6th St.

7th St.

8th St.

9th St.

10th St.

Gilman St.

Eastshore Hw

y.

WFrontage

Rd.

80

123

1 23 4

5

6

7

89

1011

1213

1 2 3 Eastshore Highway/Gilman St.4 2nd St./

Gilman St.5

4th St./Gilman St.

6th St./Gilman St.

8th St./Gilman St.6 7 8 9th St./

Gilman St.9 10th St./Gilman St.10

27 (3

6)0

(5)

2 (1

)

76 (4

8)19

7 (7

0)15

(10)

3 (3)724 (1,018)26 (11)

32 (4

8)0

(0)

20 (3

7)

17 (17)544 (451)

69 (23)

20 (15)552 (572)77 (55)

119

(461

)33

(167

)43

(122

)

22 (30)412 (393)

99 (63)

33 (2

3)58

(32)

18 (2

4)

19 (24)558 (551)11 (3)

9 (2

2)17

(58)

14 (1

9)

18 (28)424 (507)

24 (10)

63 (6

0)32

(20)

27 (4

8)

26 (21)512 (471)31 (32)

25 (2

7)21

(27)

25 (4

3)

60 (74)361 (453)

35 (17)

7 (1

8)17

(26)

25 (32)525 (450)

23 (3

6)9

(4)296 (465)

90 (60)

Gilman St.

4th

St.

Gilman St.

6 th

St.

Gilman St.

8th

St.

Gilman St.

9th

St.

10th

St.

Gilman St.

San Pablo Ave./Gilman St.

Eastshore Hwy./Harrison St.

2nd St./Harrison St.11 12 13

171

(114

)98

2 (7

77)

70 (1

13)

445

(88)

9 (4

)

22 (66)360 (304)39 (41)

119

(203

)35

2 (1

,020

)12

(34)

64 (144)269 (319)

82 (117)

16 (32)52 (28)

52 (1

86)

4 (1

)

16 (2

2)

47 (9

0)11

(15)

6 (6)3 (2)

Gilman St.

San

Pabl

o A

ve.

Harrison St.

East

shor

e H

wy.

Harrison St.

2nd

St.

5(4)

6 (1)

23 (3

8)

13 (8)

15(3

3)

25 (21)

Stop ControlSignalized Intersection

St.

San Pablo Ave.

W. Frontage Rd./Gilman St.

I-80 WB Off - Ramp/Gilman St.

I-80 EB Off - Ramp/Gilman St.

Existing Conditions Pedestrian and Bicycle Volumes

Figure 3

N

Gilman St. W. F

ront

age

Rd.

Gilman St. I-80

WB

Off

- Ram

p

Gilman St. I-80

EB

Off

- Ram

p

Gilman St. Eas

tsho

re H

wy.

2 nd

St.

Gilman St.

Harrison St.

Camelia St.

2nd St.

4th St.

5th St.

6th St.

7th St.

8th St.

9th St.

10th St.

Gilman St.

Eastshore Hw

y.

WFrontage

Rd.

80

123

1 23 4

5

6

7

89

1011

1213

1 2 3 Eastshore Highway/Gilman St.4 2nd St./

Gilman St.5

4th St./Gilman St.

6th St./Gilman St.

8th St./Gilman St.6 7 8 9th St./

Gilman St.9 10th St./Gilman St.10

Gilman St.

4th

St.

Gilman St.

6 th

St.

Gilman St.

8th

St.

Gilman St.

9th

St.

10th

St.

Gilman St.

San Pablo Ave./Gilman St.

Eastshore Hwy./Harrison St.

2nd St./Harrison St.11 12 13

Harrison St.

East

shor

e H

wy.

Harrison St.

2nd

St.

5 (2)

2 (5)

6 (4) 9 (17)6 (14)

7 (3)

1 (3)

12 (10)

)10(

12

4 (2)7 (2)

0 (1

)

1 (1

)

0 (1)1 (3)

6 (16)

)5(

1

4 (9)

0 (3)5 (4)

0 (1)0 (5)

1 (1)8 (6)

4 (5

)0

(3)

1 (0

)

2 (3)

2 (8)

21 (29)

12 (6

)

)2( 3

2 (1)12 (6)

5 (2

)

0 (1)2 (6)

8 (15)

29 (25)

7 (3

)

13 (8

)

0 (1)11 (4)2 (0)

1 (1

)7

(8)

0 (1

)

1 (0)7 (7)1 (0)

18 (13)

3 (1

4) 1 (1)13 (5)2 (1)

1 (0

)3

(2)

1 (2

)

4 (7)3 (1)

4 (9)

12 (14)

7 (1

0)

5 (5)

0 (1

)

0 (1

)

0 (1)6 (3)

0 (2)

0 (2

)

1 (2

)2(

1)

1 (0

)

0 (1)

3 (3)

2 (1)

7 (2

)

0 (4

)

1(1)7 (2)

1 (0

)1

(5)

0 (1

)

3 (11)0 (1)

6 (29)

29 (46)

18 (4

0)

16 (1

0)

0 (2)2 (2)4 (0)

1 (4

)2

(1)

0 (1

)

1 (6)

1 (4)

2 (2

)

5 (5)

0 (1

)

0 (1

)

0 (1)6 (3)

17 (6)

)6(

8

0 (1

)4

(0)

6 (2

)

0 (1

)9

(7)

0 (2

)

0 (1

)6

(7)

0 (1

)

0 (1

)4

(6)

1 (2

)

LEGENDAM Peak Hour Ped/Bike VolumesPM Peak Hour Ped/Bike VolumesPedestrian Crossing VolumeBicycle Turn Movement Volume

XX(XX)

Gilman

St.

8 (8) 1 (4)

10 (5)

29 (40)

13 (7

)

Gilman St.

San

Pabl

o A

ve.

1 (1

)

San Pablo Ave. Date Day

A. Gilman St (Between I-80 Ramps)

B. Gilman St (Between Second St and Fourth St)

C. Gilman St (Between Seventh St and Eighth St)

Volume (Vehicles)Total

Volume (Vehicles)Total

Volume (Vehicles)TotalEB WB EB WB EB WB

1/22/2016 Friday 9,851 6,889 16,740 8,687 11,194 19,881 7,757 8,148 15,905

1/23/2016 Saturday 8,024 6,153 14,177 8,833 10,198 19,031 7,852 7,856 15,708

1/24/2016 Sunday 7,083 5,890 12,973 8,239 8,786 17,025 7,066 6,884 13,950

1/25/2016 Monday 9,066 7,487 16,553 8,412 10,313 18,725 7,204 7,601 14,805

1/26/2016 Tuesday 9,386 7,536 16,922 8,328 11,044 19,372 7,164 7,920 15,084

1/27/2016 Wednesday 9,676 7,516 17,192 8,447 11,452 19,899 7,441 7,967 15,408

1/28/2016 Thursday 9,567 7,740 17,307 8,566 10,949 19,515 7,425 7,964 15,389

Average 8,950 7,030 15,981 8,502 10,562 19,064 7,416 7,763 15,178

LANE GEOMETRY, CONTROLS & TURNING MOVEMENTWEDNESDAY, 1/27/2016

PEDESTRIAN AND BICYCLE VOLUMESWEDNESDAY, 1/27/2016

» This table shows a sample plot of hourly volumes aonGilman Street between I-80 ramps on Wednesday, January 27, 2016. The westbound direction peaks between 7:00-9:00 a.m., and the eastbound direction peaks between 3:00-7:00 p.m are plotted.

MAP

Turning Movement and Average Daily Traffic Counts

Freeway and Ramp Counts


TRAFFIC CONDITIONS4b

» On average, the truck percentage on I-80 in this project area is about 4.8%.

» The highest high-occupancy vehicle (HOV) volumes on I-80 are close to 1,600 and 1,500 vehicles/hour during the AM and PM peak periods, respectively

» The bottleneck in the westbound (WB) direction in the morning is the I-80/I-580/I-880 maze. It is mainly caused by high traffic demand and extensive weaving activities.

» The bottleneck in the eastbound (EB) direction in the evening is the I-80/I-580 split due to high traffic demand as well as merging and diverging activities. This bottleneck is sometimes hidden by the downstream bottlenecks at San Pablo Dam Road and SR-4. These downstream bottlenecks sometimes back up through the I-80/I-580 split.

» The most congested times are 7:30-9:30 a.m. in the morning (WB), and 4:00-6:00 p.m. in the evening (EB).

Traffic Accident Surveillance and Analysis System (TASAS) data were obtained from Caltrans, covering three-year periods (January 2011 to December 2013) for I-80 Mainline, I-80 WB on-ramp from Gilman Street, I-80 WB off-Ramp to Gilman Street, I-80 EB on-ramp from Gilman Street, and I-80 EB off-ramp to Gilman Street.

TimeI-80 EB I-80 WB

University Ave1 Central Ave2 University Ave1 Central Ave2

AM HOV Hours (5-10 AM)

5-6 AM 92 74 1,560 1,574

6-7 AM 196 136 1,567 1,562

7-8 AM 274 191 1,431 1,258

8-9 AM 290 217 1,413 1,206

9-10 AM 351 275 1,153 910

Total 1,203 893 7,124 6,510

PM HOV Hours (3-7 PM)

3-4 PM 1,401 1,291 849 481

4-5 PM 1,464 1,368 758 409

5-6 PM 1,450 1,231 705 406

6-7 PM 1,415 1,238 622 404

Total 5,730 5,128 2,934 1,700

* Tuesdays-Thursdays only, September 15 - November 5, 2015

1 = PeMS VDS 407863; 2 = PeMS VDS 400329; 3 = PeMS VDS 407882; 4 = PeMS VDS 400628.

Location

Number of AccidentsActual Accident Rate

(Accidents/MV)2Statewide Average Accident

Rate (Accidents/MV)2

Fatal Injury Total1 Fatal Fatal+Injury Total Fatal Fatal+Injury Total

Mainline (I-80) at Gilman Street 2 48 264 0.014 0.35 1.83 0.004 0.33 1.07

WB On-Ramp from Gilman Street 0 2 2 0.000 0.29 0.29 0.002 0.22 0.63

WB Off-Ramp to Gilman Street 0 7 31 0.000 0.63 2.79 0.003 0.35 1.01

EB On-Ramp from Gilman Street 0 6 9 0.000 0.61 0.91 0.002 0.22 0.63

EB Off-Ramp to Gilman Street 0 3 4 0.000 0.46 0.61 0.003 0.35 1.01

Source: Caltrans TASAS

Notes:1 Total accidents also include Property Damage Only (PDO)2 MV = Million Vehicle

HOV Volumes (Vehicles)*

Accident Data

I-80 Accident Data

Truck Traffic and HOV Volumes

Traffic Time Data

PROJECT BUILD ALTERNATIVE5a


SCALE: 1” = 25’

PROJECT BUILD ALTERNATIVE5b


GILMAN PEDESTRIANOVERCROSSING RENDERINGS

5c


FOR INFORMATION PURPOSES ONLY - NOT TO SCALE


WHAT IS A ROUNDABOUT?6

Roundabouts are circular intersections with Specific Design Criteria used to control traffic.

Roundabout Applications:

» Most Signalized Intersections

» Closely Spaced or Offset Intersections or Driveways

» Freeway Ramp Termini

» Constrained Roadways (over crossing or under crossing)

» Intersections with High Accident Rates

» You only need to watch for traffic coming from one direction at a time

» Shorter Pedestrian Crossings

» Slower Traffic

» Pedestrian Refuges

» Landscape Separation

» Shared-Use Path

» Improved Safety

» Increased Traffic Capacity / Reduced Delay

» Environmental Benefits

• Less Emissions

• Less Fuel Consumption

• Noise Reduction

» Landscaping Opportunities

» Less Costly to Operateoverall collisions

37% reduction

75% reduction

90% reduction

40% reduction

Source: Federal Highway Administration and Insurance Institute for Highway Safety

REDUCTION IN COLLISIONS

0

20

40

60

80

100

injury collisions

fatality collisions

peds collisions

REDUCTION IN CONFLICT POINTS

ROUNDABOUT

Vehicles - 8 Conflict PointsPeds - 8 Conflict Points

4-WAY INTERSECTION

Vehicles - 32 Conflict PointsPeds - 24 Conflict Points

raised central island

truck apron

splitter island

pedestrian refuge

pedestrian path

landscape buffer

entry deflection

Benefits of the Modern Roundabout

Design Elements

Modern Roundabouts


ENVIRONMENTAL REVIEW PROCESS 7

Potential environmental impacts will be analyzed and presented to the public as required by the California Environmental Quality Act (CEQA) and the National Environmental Policy Act (NEPA).

» An Initial Study (IS) / Environmental Assessment (EA) will include the results of focused technical studies.

» The Initial Study (IS) / Environmental Assessment (EA) is scheduled for public review and comment in 2017.

Focused, technical studies are planned to consider project impacts to the following environmental resources:

» Visual/Aesthetic Resources

» Cultural Resources (historic, archaeological, & Native American coordination)

» Water Quality, Hydrology, & Floodplain

» Geology, Soils, Seismic, & Topography

» Paleontology

» Hazardous Materials

» Air Quality

» Noise & Vibration

» Wetlands

» Habitat for Special-Status Species

» Traffic, Bicycle, & Pedestrian

» Community

» Utilities feet

meters1000

300

ENVIRONMENTAL REVIEW PROCESS FLOWCHART

Environmental Resources to be Studied

Environmental Process

Prepare Environmental Technical Studies

1

Prepare IS/EA

2

Draft Environmental Document circulated to the public

3

Identify Preferred Alternative

4Prepare Final Environmental Document, including responses to comments

5

Project Approved

6

WE ARE HERE


Project Milestones 2014 2015 2016 2017 2018 2019 2020 2021 2022

PROJECT DELIVERY8

The Project Sponsors are:

» Alameda County Transportation Commission (Alameda CTC)

» City of Berkeley

The Implementing Agency is:

» Alameda CTC

The Implementing Agency is responsible for managing the scope, cost and schedule of the current Project Approval and Environmental Document (PA&ED) phase of this project.

The Lead Agency is:

» Caltrans

The Lead Agency implements environmental review under the California Environmental Quality Act (CEQA) and the National Environmental Policy Act (NEPA).

AGENCY ROLES

» Project would be funded with local, regional, and federal funds, with the major funding being provided by the Alameda County Transportation Commission via Sales Tax Measure BB.

In 2014 voters passed Sales tax Measure BB, which implements a 30-year Transportation Expenditure Plan by renewing an existing 0.5 percent transportation sales tax approved in 2000, and increasing that tax by 0.5 percent, for a full 1.0 percent.

» Transportation Expenditure Plan commits $24 million for the I-80/Gilman Street Interchange Improvement Project, with additional funding from the Federal Highway Administration (FHWA) and the City of Berkeley.

Current project cost estimate: $24 million for construction.

FUNDING

Complete Conceptual Design

Environmental Review

Final Design / Right-of-Way

Construction

Opening Day

1

2

3

4

5

Summer 2017 Draft Environmental Document

Winter 2017 Complete Environmental Review / Implement Preferred Alternative

We are here

2018 Final Design Document

2020 Construction Starts

2022 Opening Day

Fall 2014 Complete

Conceptual Design

Project Schedule

Agency Roles and Funding

1 i-80/gilman street interchange improvement …...apr 25, 2016 · 6-7 pm 492 6-7 pm 626 6-7 pm...

Documents