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Life in the Fast (and SAFE!) LaneLessons Learned in Planning, Opening, and Operating Atlanta’s First Reversible Express Lanes Project
September 12, 2017
Annie Gillespie, PEDirector of Engineering, SRTA
Mark Demidovich, PEAssistant State Traffic Engineer, GDOT
I-75 South Express Lanes
• Located southeast of Atlanta• 12 miles long• 2-lane typical section• Barrier-separated and reversible• Registered facility
• No trucks, no trailers• No occupancy requirements
I-75 South Express Lanes (2)
• Design/Build contract• 1 year for design• 2.5 years for construction• $226M total project budget
• Opened to traffic – January 28, 2017• Opened to tolling – February 12,
2017
Photo: CW Matthews, 2015
I-75 South Weekday Average Trips
4190
5740
3680 40
10 4640 51
80 5580 60
00 6350
4770
6150 6340
6420 69
20 7380
7380
8970
7210 76
80 7950 82
00 8430
5260
8200
7810
7780
7920
8030
7980
8030
8870
2000
3000
4000
5000
6000
7000
8000
9000
10000
30-Ja
n - 5
-Feb
6-Fe
b - 1
2-Fe
b
13-F
eb -
19-F
eb
20-F
eb -
26-F
eb
27-F
eb -
5-M
ar
6-M
ar -
12-M
ar
13-M
ar -
19-M
ar
20-M
ar -
26-M
ar
27-M
ar -
2-Ap
r
3-Ap
r - 9
-Apr
10-A
pr -
16-A
pr
17-A
pr -
23-A
pr
24-A
pr -
30-A
pr
1-M
ay -
7-M
ay
8-M
ay -
14-M
ay
15-M
ay -
21-M
ay
22-M
ay -
28-M
ay
29-M
ay -
4-Ju
n
5-Ju
n - 1
1-Ju
n
12-Ju
n - 1
8-Ju
n
19-Ju
n - 2
5-Ju
n
26-Ju
n - 2
-Jul
3-Ju
l - 9
-Jul
10-Ju
l - 1
6-Ju
l
17-Ju
l - 2
3-Ju
l
24-Ju
l - 3
0-Ju
l
31-Ju
l - 6
-Aug
7-Au
g - 1
3-Au
g
14-A
ug -
20-A
ug
21-A
ug -
27-A
ug
28-A
ug -
3-Se
p
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Aver
age
# of
Trip
s
Toll System - Northbound
NORTH
Toll System - Southbound
NORTH
Toll System - Equipment
• Dual gantries• Neology Lane System and
Operational Back Office• Antennas on Toll Rate signs
and over GP lanes• Dynamically priced
Photo: SRTA, 2016
Roadway Access Control System (RACS)
• Multiple warning gates • One barrier gate• Multiple CMS with
distance/closed messaging
Photo: SRTA, 2017
Phot
o: S
RTA,
201
7
Agency Roles and Responsibilities
• SRTA• Toll integration• Dynamic pricing• Toll collection
• GDOT• Construction of facility• Operation of RACS • Incident response• HERO patrol
Photo: CW Matthews, 2017
Photo: GDOT, 2016
Highway Emergency Response Operator
• HERO program began in 1994• Now includes over 100 Operators• Patrol ATL interstates 24/7/365• Primary responsibilities
• Incident Response• Traffic Control• Moving vehicles• Cleaning up debris
System Redundancy
• Natural gas generators• Mobile generator
• Hub-to-hub failover
Photo: SRTA, 2016
Software Redundancy
• Primary reversal software is RACS
• Built into GDOTs ATMS software
• Communicates directly with SRTA’s toll system
Screenshot: Parsons Transportation Group – iNet software, 2017
Software Redundancy (2)
• Backup reversal software
• Does not communicate with SRTA’s system
• Provided by Design/Build team
Screenshot: Flir– Cameleon software, 2017
Software Redundancy (3)
• HMI located in roadside cabinets near access points
• HEROs can operate gates using drills or hand cranks
Photo: GDOT, 2017
Operations PlanningGDOT RACS/TMC STAFF GATES GDOT SIGNS SRTA ITS TR SIGNS TFH
Northbound-Southbound
SELECT NB to SB REVERSAL
SEND TOLL CHECK
SEND Toll START
toll_check
toll_response (requested changes completed)
toll_start (south)
SET ACS 1 SIGNS TO CLOSE CLOSECMS-701CMS-703CMS-704CMS-705
toll_response (requested changes completed)
SET TP1 TR SIGN TO CLOSED
CLOSE75A-215.6-CMS-CMS01
toll_sign (I75-TP1)(close signs)
CLOSE GATES @ ACS 1
toll_response (requested changes completed)
CLOSE WG - 101
CLOSE BG - 106
CLOSE WG - 102
OPEN WG - 103
CLOSE WG - 104
CLOSE WG - 105
CLOSE WG - 107
CLOSE WG - 108
CLOSE WG - 110
CLOSE WG - 109
CLOSE WG - 111
OPEN U-TURN GATES @ ACS 1
SET ACS 2 SIGNS TO CLOSECLOSECMS-706CMS-708CMS-709CMS-707CMS-710CMS-711
SET TP1 TO SB SET TP1 TO SOUTHtoll-control-command(SOUTH)
ws_response (requested changes completed)
tollcontrol_request(I75-TP1)(S)
tollcontrol_response(request changes completed)
SET TP2 TR SIGN TO CLOSED toll_sign (I75-TP2)(close signs)
toll_response (requested changes completed)
CLOSE GATES @ ACS 2
CLOSE WG - 201
CLOSE BG - 206
CLOSE WG - 202
CLOSE WG - 203
CLOSE WG - 204
CLOSE WG - 207
CLOSE WG - 208
CLOSE WG - 211
CLOSE WG - 210
CLOSE WG - 209
OPEN WG - 205OPEN U-TURN GATES @ ACS 2
CONDUCT CAMERA SWEEP
SET ACS 1 SPEED SIGNS TO CLOSE CLOSE
CMS-702
pingpong
toll_startws_response (requested changes completed)
“CLOSED” to override
message queue
post “CLOSED”
toll_sign (CLOSE SIGNS)ws_response (requested changes completed)
CLOSE75A-218.6-CMS-CMS01
“CLOSED” to override
message queue
post “CLOSED”
toll_sign (CLOSE SIGNS)ws_response (requested changes completed)
OPEN WG 205 ACS 2
SET TP2 TO SB SET TP2 TO SOUTHtoll-control-command(SOUTH)
ws_response (requested changes completed)
tollcontrol_request(I75-TP2)(S)
tollcontrol_response(request changes completed)
SET ACS 3 SIGNS TO CLOSEClose CMS-712CMS-715CMS-719CMS-716CMS-720
SET TP3 TR SIGN TO CLOSED
toll_sign (I75-TP3)(close signs)
toll_response (requested changes completed)
SET SIGNAL @ JBO TO SB SIGNAL
CLOSE GATES @ ACS 3 CLOSE WG - 305
CLOSE WG - 304
CLOSE BG - 302
CLOSE WG- 301
SET TP3 TO SB SET TP3 TO SOUTHtoll-control-command(SOUTH)
ws_response (requested changes completed)
tollcontrol_request(I75-TP3)(S)
SET TP5 TO SB SET TP5 TO SOUTHtoll-control-command(SOUTH)
ws_response (requested changes completed)
tollcontrol_request(I75-TP5)(S)
SET TP6 TO SB SET TP6 TO SOUTHtoll-control-command(SOUTH)
ws_response (requested changes completed)
tollcontrol_request(I75-TP6)(S)
OPEN GATES @ ACS 4
OPEN WG - 401
OPEN WG - 402
OPEN WG - 403
OPEN BG - 404
OPEN GATES @ ACS 7
OPEN WG - 705
OPEN WG - 701
OPEN WG - 702
OPEN WG - 703
OPEN WG - 704
OPEN WG - 706
OPEN WG - 707
OPEN WG - 709
OPEN WG - 708
SET TP5 TR SIGN TO OPEN toll_sign (I75-TP5)(open signs)
SET ACS 7 SIGNS TO OPEN OpenCMS-723CMS-724CMS-726CMS-725CMS-727CMS-728CMS-729
CLOSE WG - 405CLOSE U-TURN GATES @ ACS 4
CLOSE GATES @ ACS 5
CLOSE WG - 502
toll_response (requested changes completed)
tollcontrol_response(request changes completed)
tollcontrol_response(request changes completed)
SET RAMP SIGNAL & BEACON TO SB SIGNAL
tollcontrol_response(request changes completed)
SET ACS 3 SPEED SIGNS TO CLOSE Close
CMS-713CMS-717
CLOSE75A-JBO-CMS-CMS31 75A-JBO-CMS-CMS11 75A-JBO-CMS-CMS01
“CLOSED” to override
message queue
post “CLOSED”
toll_sign (CLOSE SIGNS)ws_response (requested changes completed)
OPEN75A-228.1-CMS-CMS2175A-228.6-CMS-CMS21
Remove override message queue
post <toll-rate>
toll_sign (OPEN SIGNS)ws_response (requested changes completed)
*
*
CLOSE GATES @ ACS 5
CLOSE WG - 504
CLOSE WG - 503
CLOSE WG - 502
CLOSE BG - 501
CLOSE U-TURN GATES @ ACS 6 CLOSE WG-603
OPEN GATES @ ACS 6
OPEN WG - 606
OPEN WG - 601
OPEN WG - 602
OPEN WG - 604
OPEN BG - 605
OPEN WG - 607
OPEN WG - 608
SET TP6 TR SIGN TO OPEN toll_sign (I75-TP6)(open signs)
SET ACS 6 SIGNS TO OPENOPENCMS-730CMS-731CMS-732CMS-734
SEND TOLL ENDtoll_end(South)
toll_response (requested changes completed)
toll_response (requested changes completed)
SET ACS 6 SPEED SIGNS TO OPEN OPEN
CMS-733
OPEN75A-001.5-CMS-CMS21
Remove override message queue
post <toll-rate>
toll_sign (CLOSE SIGNS)ws_response (requested changes completed
toll_endws_response (requested changes completed
Toll rates are continuously sent by DPS and being placed into the toll-rate message queue- posted to sign
only if no override
for each sign (in sequence)when closing – sets “CLOSED” message in software override queue, updates phys when opening – removes the message in software override queue, updates physi
*
Operations Planning (2)
Operations Planning (3)GDOT RACS/TMC STAFF GATES GDOT SIGNS SRTA ITS TR SIGNS TFH
Northbound-Southbound
SELECT NB to SB REVERSAL
SEND TOLL CHECK
SEND Toll START
toll_check
toll_response (requested changes completed)
toll_start (south)
SET ACS 1 SIGNS TO CLOSE CLOSECMS-701CMS-703CMS-704CMS-705
toll_response (requested changes completed)
SET TP1 TR SIGN TO CLOSED
CLOSE75A-215.6-CMS-CMS01
toll_sign (I75-TP1)(close signs)
CLOSE GATES @ ACS 1
toll_response (requested changes completed)
CLOSE WG - 101
CLOSE BG - 106
CLOSE WG - 102
OPEN WG - 103
CLOSE WG - 104
CLOSE WG - 105
CLOSE WG - 107
CLOSE WG - 108
CLOSE WG - 110
CLOSE WG - 109
CLOSE WG - 111
OPEN U-TURN GATES @ ACS 1
SET ACS 2 SIGNS TO CLOSE CLOSECMS-706CMS-708CMS-709CMS-707CMS-710CMS-711
SET TP1 TO SB SET TP1 TO SOUTHtoll-control-command(SOUTH)
ws_response (requested changes completed)
tollcontrol_request(I75-TP1)(S)
tollcontrol_response(request changes completed)
SET TP2 TR SIGN TO CLOSED toll_sign (I75-TP2)(close signs)
toll_response (requested changes completed)
CLOSE GATES @ ACS 2
CLOSE WG - 201
CLOSE BG - 206
CLOSE WG - 202
CLOSE WG - 203
CLOSE WG - 204
CLOSE WG - 207
CLOSE WG - 208
CLOSE WG - 211
CLOSE WG - 210
CLOSE WG - 209
OPEN WG - 205OPEN U-TURN GATES @ ACS 2
SET TP2 TO SB SET TP2 TO SOUTHtoll-control-command(SOUTH)
ws_response (requested changes completed)
tollcontrol_request(I75-TP2)(S)
tollcontrol_response(request changes completed)
SET ACS 3 SIGNS TO CLOSEClose CMS-712CMS-715CMS-719CMS-716CMS-720
SET TP3 TR SIGN TO CLOSED
toll_sign (I75-TP3)(close signs)
toll_response (requested changes completed)
SET SIGNAL @ JBO TO SB SIGNAL
CLOSE GATES @ ACS 3 CLOSE WG - 305
CLOSE WG - 304
CLOSE BG - 302
CLOSE WG- 301
SET TP3 TO SB SET TP3 TO SOUTHtoll-control-command(SOUTH)
ws_response (requested changes completed)
tollcontrol_request(I75-TP3)(S)
SET TP5 TO SB SET TP5 TO SOUTHtoll-control-command(SOUTH)
ws_response (requested changes completed)
tollcontrol_request(I75-TP5)(S)
SET TP6 TO SB SET TP6 TO SOUTHtoll-control-command(SOUTH)
ws_response (requested changes completed)
tollcontrol_request(I75-TP6)(S)
OPEN GATES @ ACS 4
OPEN WG - 401
OPEN WG - 402
OPEN WG - 403
OPEN BG - 404
OPEN GATES @ ACS 7
OPEN WG - 705
OPEN WG - 701
OPEN WG - 702
OPEN WG - 703
OPEN WG - 704
OPEN WG - 706
OPEN WG - 707
OPEN WG - 709
OPEN WG - 708
tollcontrol_response(request changes completed)
tollcontrol_response(request changes completed)
CONDUCT CAMERA SWEEP
SET RAMP SIGNAL & BEACON TO SB SIGNAL
tollcontrol_response(request changes completed)
SET ACS 3 SPEED SIGNS TO CLOSE Close
CMS-713CMS-717
SET ACS 1 SPEED SIGNS TO CLOSE CLOSE
CMS-702
pingpong
toll_startws_response (requested changes completed)
“CLOSED” to override
message queue
post “CLOSED”
toll_sign (CLOSE SIGNS)ws_response (requested changes completed)
CLOSE75A-218.6-CMS-CMS01
“CLOSED” to override
message queue
post “CLOSED”
toll_sign (CLOSE SIGNS)ws_response (requested changes completed)
CLOSE75A-JBO-CMS-CMS31 75A-JBO-CMS-CMS11 75A-JBO-CMS-CMS01
“CLOSED” to override
message queue
post “CLOSED”
toll_sign (CLOSE SIGNS)ws_response (requested changes completed)
Remove override message queue
*
Wait in position
Assist with ACS 1 if necessary
HERO
ACS 1 Looking at Gates
In GP lanes NB Prior to CMS
set #1
At ACS 1 in GP lanes SB near
SR 155 exit ramp
123
Observe NB gates close and
U-turn gate open
Confirm TMC via radio
Observe NB gates close and
open u-turn gate
Confirm TMC via radio
Drive northward to
just before ACS 2
Verify TMC left turn lane is
clear
Observe NB gates close.
Confirm TMC via radio.
Tell HERO 1&2 last vehicle coming
Drive North to JBO Enterance
Merge area
Drive North to JBO Enterance
Merge area
Receive Info from HERO 3
Receive Info from HERO 3
Resume non-Express
patrolling
Drive N @ 30mph to I-75/
675 split
Drive N @ 30mph to I-75/
675 split
Observe SB gate open
Drive North on Express Ramp to I-675 past
gate set 5
Drive North on EL and position just past WG-
405
Enter ACS 2. Stage at end of
split ramp.
Ride NB on GP, and exit at JBO. Position at exit
lane on JBO ramp
Confirm TMC location via
radio
Confirm TMC location via
radio
Observe SB gate open
Confirm TMC via radio
Travel 75 N GP to 675 NB GP. Exit at SR 138,
re-enter 675 SB GP. Stage at
salt barn cross over near ACS
6
Take SR 138 across to I-75 SB. Assist with
gate set 7 if necessary
*TP must be set AFTER HERO confirms last
vehicle left the EL
*TP must be set AFTER HERO confirms last
vehicle left the EL
Operations Planning (4)
• Plans• Workflows• HERO placement
diagrams• In-field verification
Photo: CW Matthews, 2017Phot
o: G
DOT,
201
7
HERO Program Expansion
• Created a Master Operator position specifically for Express Lanes
• Hired from existing pool of HEROs, and backfilled with new hires
• Currently have 20 Master Operators
• Extensive training• Classroom• In-field
Photo: GDOT, 2017
HERO Express Lane Duties
• Support reversals• Sweep lanes before reversals• Provide manual backup for
reversals • Operate emergency access
gates• Clearing debris• Incident response• Traffic control
HERO training, 2016
Emergency Responders
• Coordination with many agencies• Henry Co Fire and police• Clayton Co Fire and police• Sheriff’s office• Georgia State Patrol• Department of Public Safety
• Presentations & table top exercises
• Concerns about accessing facility during incidents, concerns about wrong way vehicles
Wrong Way Vehicles
• System-generated alerts• Operator protocol• Entering in correct
direction and making U-turns
• WWV’s are rare
Wrong Way Vehicles
• System-generated alerts• Operator protocol• Entering in correct
direction and making U-turns
• WWV’s are rare
Wrong Way Vehicles (2)
Photo: Neology, 2017
Wrong Way Vehicles (3)
Photo: Google maps, 2017
NB Express Entrance
NB GP Entrance
SB GP Entrance
Other Incidents
Photo: Google maps, 2017
• Luckily no major incidents so far
Northwest Corridor
Photo: Google maps, 2017
• 3X the size• 3X the emergency
responders to coordinate• 2X as many toll points• 3X the O-D pair
combinations• 5X the anticipated trip
volumes
Photo: Northwest Express Roadbuilders, 2017
Annie Gillespie, PEDirector of [email protected]
Mark Demidovich, PEAssistant State Traffic Engineer
Thank you for your time.