Transportation and Health Part I

In a previous blog post, I discussed the relationship “place” has with public health. I explained that there are many characteristics of a specific location that affect the health and well being of its citizens. In one example, I talked about the role transportation has for providing citizens with access to quality and affordable health care. Transportation has a large role in the health of a community, much larger than just providing health care access to citizens. I will be focusing on the connection between public health and transportation over the next few blog posts. This post will focus on traffic safety while the following posts will discuss environmental health issues and walkability.

Traffic safety is important. Motor vehicle fatalities are the leading cause of death for Americans under the age of 34. The highest rate of driving fatality occurs between the ages of 21 and 24. More experienced drivers are less likely to get into a fatal crash, however, more than 37,000 people each year die from a motor vehicle accident.

A significant proportion of motor vehicle deaths and injuries involve pedestrians and cyclists. Pedestrians and cyclists account for thirty-five percent of motor vehicle deaths and twenty-one percent of motor vehicle injuries.

Many accidents tend to occur in built-up areas where more pedestrians are affected. The highest risk areas for pedestrians and cyclists are on minor roads, especially around intersections. Sadly, schools and neighborhoods are often situated off these arterial roads, putting children at risk.

There are a variety of reasons for why traffic accidents occur. The three major reasons are the road, the car, and the driver. Roadway designs can greatly affect the rate of accidents in a certain area. Some roadways are better designed than others. The space between lanes, the length of merge lanes, whether there is a stop sign or traffic signal at an intersection, placement of traffic signs, posted speed limits, and roadway visibility are just some of the many variables that affect the safety of certain roads. Oftentimes, roadways are engineered exceptionally well, but over time, population growth, nearby development, and changes in traffic behavior put stress on roads and intersections. Interestingly, some transportation planners make roadways more dangerous to decrease risky driving behavior. Two ideas for making Tamiami Trail safer was to decrease the width of each lane or put roadside parking on the Trail in the downtown area. This would slow down traffic and force drivers to be more aware of their surroundings. It is what engineers call “traffic calming.”

Traffic engineers measure the quality of road infrastructures through a Level-of-Service (LOS) assessment that measures traffic flow on an A-F scale, F being the worst rating. Newly designed roads often score an A or B, even during rush hour. However, overtime, LOS ratings tend to drop as roadways reach their capacity. Many of Sarasota’s roadways have a D or F rating during rush hour. Low ranked roads can have serious safety issues, especially to pedestrians and cyclists. Driver stress and road rage increases at lower LOS ratings and many driving maneuvers become riskier.

Cars are often the cause of an accident. Popped tires, breakdowns, weak brake pedals, etc. There are many new car features on the market that have been proven to decrease vehicular accidents. Electronic stability control (ESC) is a newer feature that detects whether a vehicle is exceeding its handling capabilities. If a vehicle were at risk for losing control, the electronic stability control technology would reduce engine power and automatically apply braking power to individual wheels. ESC is only standard on some vehicles and optional in others. Car manufactures are also making vehicles safer for pedestrians in case there is an accident by designing the front-end of a vehicle in a certain way to decrease the force of impact on a pedestrian.

However, drivers are nearly always the primary cause of an accident. Speeding, reckless driving, impaired driving, road rage are all driving risks that the driver can avoid. The most common type of accident in Sarasota County are rear-end collisions. This type of accident is usually caused by a driver who was not paying attention. The most accident-prone intersection in Sarasota County is Center Road at U.S. 41.

Overall, traffic safety is a major concern. Deaths and injuries to drivers, passengers, pedestrians, and cyclists occur too often and can be easily avoided. Traffic engineers and city officials are always working towards improving roadways, car manufacturers are putting a large emphasis on safety features (not only features that protect individuals in case of an accident, but prevent accidents in the first place), and police officers and traffic safety campaigns are being aimed at stopping and preventing bad driving behavior. The life and safety of many residents are tied to transportation safety.

More information:
National Highway Traffic Safety Administration
Pedestrian Safety in Florida