Traffic fads and the aging driver

We all are getting older, and so is our brain, which among other tasks, mediates response time and the myriad inputs involved in driving a car. 

Certainly those with real disabling neurological diseases should not drive, but the vast majority of the Medicare set do not have a medical disorder at all, in spite of the forces that would like to transform the definition of such normal aging to the diagnosis of “Mild Cognitive Impairment.”

This is a major social-political issue, but this article is narrower, about how an aging population compounds the damage of the current trends in traffic design that could increase danger for us all.

I’ve focused on two issues relating to this: The first is the ubiquitous four way stop signs, and the second is the trend to roundabouts and various traffic calming devices that are more challenging to drivers, especially older ones.

This is no trivial issue as, “The National Highway Traffic Safety Administration estimates that distraction and inattention contribute to 20 to 30 percent of reported crashes.” With fatalities approaching 50,000 a year, we dare not allow decisions to be made out of habit or lack of the most serious study. Distraction is not only technology induced, but is caused by political decisions that causes a driver to check for a police car before driving quite safely at a slow speed through an unwarranted four way stop sign.

I recently sent a letter to the members of the Encinitas City Council opposing the removal of a specific traffic light that is slated to be replaced by a roundabout for these very reasons. Last week, the New York Times had an article that described exactly what I warned the council of: “The simple act of turning left … is confounded by a traffic circle, where an attempt to head east casts the driver into a ballet of choosing the proper lane, looking for the exit and maintaining a high alert in the crush of beach-seeking vehicles.”

Local municipal authorities and traffic engineering departments seem to have adopted, a bit too uncritically, the worldwide trend to transform cities that grew with the automobile into idealized villages. Roundabouts are in and traffic lights are out.

Those roundabouts that are popular usually replace four way stop signs, which are primitive as traffic control but highly effective for politically powerful communities to keep drivers from less august regions from using “their” thoroughfares. The cost in lost time and increased pollution of these signs that defy traffic-engineering standards is ignored, or they would be replaced by more effective devices that fit actual traffic patterns.

We now have little tolerance for those who text while driving, but we have yet to even acknowledge that increased complexity of a given traffic device has the same debilitating effect as answering a cell phone or other distractions.

This additional mental effort, most challenging to the increasing numbers of older drivers, may not cause a crash at the site, but increase the stress level of the driver who has an accident down the road, thus defying statistical validation of this effect.

Perhaps some day we will not have to depend on that vulnerable organ the human brain to control the complex and challenging task of driving a car, but until that time arrives driver capacity should be a major part of our approach to traffic safety.

Al Rodbell is an Encinitas resident. Visit for further references and links on this subject.


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