Roadside Safety Proven Countermeasures. Emmett McDevitt Transportation Safety Engineer Federal Highway Administration
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1 Roadside Safety Proven Countermeasures Emmett McDevitt Transportation Safety Engineer Federal Highway Administration
2 Safety Statistics On average each year 43,000 + people die in traffic related crashes. On average 3.2 Million are injured Family Co-Workers Friends
3 Major League Baseball Field Seating capacity 41,000 to 47,000 Population of Phoenix Arizona 3,251,876
4
5 National Safety Objectives Roadway Departure Intersections Pedestrians
6 National Safety Objectives Roadway departure Minimize roadway departures Reduce severity of roadway departures
7 Run-Off Off-the-Road Average of 14,000+ fatalities per year About 39% of total average fatalities
8 Intersections Average of fatalities per year; About 21% of total average fatalities
9 Pedestrians Average of fatalities per year About 11% of total average fatalities
10 Run-off off-road Crashes 42% occur on curves 50% in rural areas 42% are rollovers and life threatening events 25% are collisions with trees
11 Run-Off Off-the-Road Problem +1/3 of all Traffic Fatalities 2/3 on 2-lane 2 roads 1/2 at night
12 Run-off off-the-road Inattention Reasons Poor visibility Speeding Impaired Driving Avoidance of obstacle
13
14
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16 Welcome to Boise
17
18 RUMBLE STRIPS Milled-in Centerline Rumble Strips
19 Quick History Rumble Strips NYSTA Retrofitted entire system in the years between Entire NYS system of Interstates, Expressways and Freeways were retro-fitted by late 1990 s Both enjoyed an average 65% reduction in ROTR accidents
20 Shoulder Rumble Strips Studies show reductions in ROR crashes with presence of shoulder rumble strips. 70 % Pennsylvania Turnpike, % New Jersey Turnpike, % New York State, % New York Thruway, % Massachusetts Turnpike, % Washington, % California Interstate, % Kansas Turnpike, 1991
21 Rumble Stripes Night + Rain Conditions
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23 Experimental use of: Wet reflective PM s Grooved in PM Grooved in High profile beads (1.9 index) Grooved in Wet-reflective tape Grooved in True Wet reflective paint with elements
24 Grooved in True Wet Reflective Element
25 The Problem
26
27
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29 Dangerous Drop-Offs
30
31 The Cause Erosion from tires Erosion from weather Successive overlays without sufficient backfill
32 The Result
33 The Solution Safety Edge
34 Wedge Joint
35
36 Better Guidance and Delineation
37 HORIZONTAL CURVES Widened/Stabilized Lane or Shoulder on Inside of Curve, Cheverons if appropriate
38 Priority Order of Treatment Remove obstacle Make potential hazard traversable Relocate obstacle Reduce impact severity Shield obstacle Delineate obstacle
39 Run-off off-the-road Solutions Remove obstacle BEFORE AFTER Digitally enhanced photograph
40 Eliminate Need for Guiderail
41
42
43 Fixed Objects
44 Priority Order of Treatment Remove obstacle Make potential hazard traversable Relocate obstacle Reduce impact severity Shield obstacle Delineate obstacle
45 Before After
46
47 What s wrong with this picture?
48 SLOPES, EMBANKMENTS AND DITCHES VERTICAL DROP-OFF UTILITY POLE IN DITCH NON-TRAVERSABLE FORESLOPE
49 Roadside Hazard Fatalities Tree 28% Other 10% Conc. Barrier 2% Br. Rail 2% Sign Post 6% Fence 4% Culvert 5% Curb 6% Embankment 10% Utility Pole 9% Guardrail 10% Ditch 8%
50 Priority Order of Treatment Remove obstacle Make potential hazard traversable Relocate obstacle Reduce impact severity Shield obstacle Delineate obstacle
51 Run-off off-the-road Relocate obstacle BEFORE AFTER
52
53 Priority Order of Treatment Remove obstacle Make potential hazard traversable Relocate obstacle Reduce impact severity Shield obstacle Delineate obstacle
54 Run-off off-the-road Reduce impact severity with Crashworthy Devices
55
56 Priority Order of Treatment Remove obstacle Make potential hazard traversable Relocate obstacle Reduce impact severity Shield obstacle Delineate obstacle
57 Shielding the object
58 Roadside Hazard Fatalities Tree 28% Other 10% Conc. Barrier 2% Br. Rail 2% Sign Post 6% Fence 4% Culvert 5% Curb 6% Embankment 10% Utility Pole 9% Guardrail 10% Ditch 8%
59 Priority Order of Treatment Remove obstacle Make potential hazard traversable Relocate obstacle Reduce impact severity Shield obstacle Delineate obstacle
60 Run-off off-the-road Delineate obstacle
61 Better Guidance and Delineation
62 Warn Run-Off Off-the-Road Remove Relocate Reduce Impact Shield Delineate
63
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