© 2014 hdr, all rights reserved. i5-broadway weilder – safety analysis jon makler, odot miranda...
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© 2014 HDR, all rights reserved.
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I5-Broadway Weilder –
Safety Analysis
Jon Makler, ODOT
Miranda Wells, HDR
OR ITE Winter Workshop
February 26th, 2015
I-5 Northbound/Southboundo Going to Morrison Ramps
Arterial Networko Broadway and Weilder
I-84 Eastbound Just past Grand Ramp
Study Area
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Emergency Braking = Deceleration Rate Greater than 14.8 ft/sec
Existing Crashes Compared to Existing Calibrated VISSIM Results
Emergency Braking
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Southbound Event Analysis
In the no-build scenario (A2), there are roughly 80,000 events.
Most (84%) events occur north of Broadway. In the “facility plan” scenario (B2), there are roughly
35,000 events SB (57% reduction). The basic braid (c2) sees more events SB (38,000)
compared to B2. The “double braid” scenario (C2) has 36,000 events SB
– in between B2 and c2. Adding the two-lane flyover makes each scenario safer
SB. All the “build” scenarios reduce SB events north of
Broadway by more than 60%. Only the braid options reduce SB events south of Broadway by a significant degree and the double-flyover makes a big difference.
Going to Broadway
Broadway to Morrison
Total
A1 55,529 12,818 63,348
A2 68,106 13,289 81,305
B1 13,078 16,759 29,837
B2 18,203 16,306 34,509
C1 19,391 7,209 26,600
C2 25,985 9,826 35,810
c1 18,170 7,183 25,352
c2 27,890 10,315 38,206
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SB Total NB Total
Option A2: No-build 68,016 13,289 81,305 18,883 10,852 29,735Option A1: No-build with two lane flyover 55,529 12,818 68,348 18,282 9,799 28,080Option B1: Auxiliary lanes with two lane flyover 13,078 16,759 29,837 18,911 4,873 23,784Option B2: Auxiliary Lanes 18,203 16,306 34,509 18,756 4,670 23,426Option C1: Double Braid with two lane flyover 19,391 7,209 26,600 19,228 5,742 24,970Option C2: Double Braid 25,985 9,826 35,810 18,786 4,756 23,542Option c1: Single Braid with two lane flyover 18,170 7,183 25,352 19,471 5,053 24,524Option c2: Single Braid 27,890 10,315 38,206 18,949 4,562 23,511
Going On-Ramp to Broadway Off-
Ramp
Broadway Off-Ramp to
Morrison Off-Total
NB Broadway On-ramp to Going
Off-ramp
NB Morrison to Broadway On-
rampTotal
Option A1 vs. A2 5% - 20% <5% 5% - 20% <5% 5% - 20% 5% - 20%Option B1 vs. A2 >60% <5% >60% <5% >60% 40% - 60%Option B2 vs. A2 >60% <5% >60% <5% >60% 40% - 60%Option C1 DB vs. A2 >60% >60% >60% <5% >60% 5% - 20%Option C2 DB vs. A2 >60% 40% - 60% >60% <5% >60% 40% - 60%Option c1 SB vs. A2 >60% >60% >60% <5% >60% 5% - 20%Option c2 SB vs. A2 >60% 40% - 60% >60% <5% >60% 40% - 60%
Southbound Northbound
Why Emergency Braking? Closely Spaced Interchanges and bottlenecks spilling back into the study area are not accounted for in deterministic safety analysis.
What are the Results Showing? • Overall significant reductions in emergency braking
instances for all the Build Options• Adding a two lane flyover for the braided options improves
safety on I-5
Southbound visual representation of data
Heat Maps
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Weilder – I-84 Weave
