Not only do traffic engineers prioritize safety lower than residents, the designs that supposedly increase safety cause more death and destruction. Why? Because motorists behave differently than engineers expect.
Traffic engineers? safety improvements include paving wider lanes and shoulders, removing roadside trees, straightening tight curves, etc.? According to AASHTO standards, ?every effort should be made to use as high a design speed as practical to attain a desired degree of safety.?
Traffic engineers believe that designing for high speed will provide safety.
The crash data, however, show ?wider lanes and shoulders were associated with statistically significant increases in crash frequencies.?
Noland reports that traditional ?road ?safety improvements? actually lead to ? increases in total fatalities and injuries,? because ?this type of approach tends to ignore behavioural reactions to safety improvements?.
Dumbaugh reports that ?a behavior-based understanding of safety performance is supported by research and literature in the field of psychology, which has focused on the subject of traffic safety as a means for understanding how individuals adapt their behavior to perceived risks and hazards.?
We?ve seen that traffic engineers might improve safety by becoming better social scientists. Before following that, however, our next installment of Learning to Love Your Traffic Engineer will look at cost.
It?s hard to learn to love our traffic engineers ? they don?t see the same world we do, and don?t want to talk about it. Why not? Have you been to a public meeting?
The public has issues – many residents have not learned to disengage knee-jerk thinking, do their homework or propose constructive suggestions. Some are hostile to any government action, including road projects.
We choose to live in West Windsor because of the promise of safety, good schools, open space and convenient train commuting. We love our cars, but don?t want traffic in our neighborhoods.
Charles Marohn, an engineer and planner, identifies the different values of residents and engineers. In order, residents prioritize safety, low cost, traffic volume and speed, while engineers prioritize speed, volume, safety and cost.
Value divergence shows in the effort to improve walking and biking along Cranbury Road. Despite WWBPA recommendations, residents? public comments and numerous yard signs asking motorists to Drive 25, traffic calming was rejected as a project goal.
We?re determined to learn to love our engineers, so in our next installment we?ll focus on the most divergent values ? speed and volume.
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The WWBPA believes that building a bicycle and pedestrian friendly community benefits everyone, not just bicyclists and pedestrians. Now there’s even more proof, coming from Portland, OR.
In a recent email, Greg Raisman of the Portland Bureau of Transportation, notes:
“Portland has had 6 of the past 12 years with zero bicycle fatalities. 2010 and 2008 were two of those years with zero bicycle fatalities. However, that’s only one part of a more important story.
Our experience has been similar to other multi-modal cities. As cities work to make walking and bicycle riding more safe, it remains true that bicycle and pedestrian safety significantly improves. However, the greatest safety benefits are realized by people driving cars and trucks.
In Portland, the numbers speak loudly. Over the past 25 years, the City has seen a long-term, downward trend in total traffic fatalities that is being reduced approximately 6 times faster than the rate for the US. In 1986, there were 79 traffic fatalities, with 61 motor vehicle deaths. In 1996, there were 59 total traffic fatalities with 41 motor vehicle fatalities. In 2010, we had 26 total traffic fatalities with 11 motor vehicle fatalities.”
So there you have it – building a bicycle and pedestrian friendly community not only raises property values, it creates safer streets for motorists, bicyclists and pedestrians. Everyone wins, not just bicyclists and pedestrians.
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Monthly meetings are held on the second Thursday of the month, at 6:15 pm at the WW library and via Zoom. Email us at [email protected] for details, including the Zoom code.
Find us at the West Windsor Farmers Market (Vaughn Drive parking lot) from 9 a.m. to 1 p.m. every other Saturday from May through Halloween.
