The Texas Department of Transportation is in the midst of a
debate about increasing the speed limit on a stretch of highway to 85 mph. If
this happens, then this section of road will hostthe highest speed limit in the
United States. Should Texas then expect
to experience more car accidents on this highway then?
What is the relationship between speed limits and accident
frequency? Will higher speed limits
always lead to more accidents? In nearly
every study made, the answer is no. However, when accidents happen at higher
speeds, the damages and injuries are much more severe. Fatality rates in high speed accidents are
always higher than in those at lower speeds.
Given that, how do traffic engineers determine the safest speed limit on
any given stretch of highway?
Well, the formula that is most commonly used now is to set
the speed limit at a speed at which 85%
of the drivers would drive at any given location in optimum weather conditions.
This is because the real factor in
determining the likelihood of an accident is the speed disparity between the
fastest and the slowest cars. The
majority of drivers rarely drive faster than their speed comfort zone. This might seem ridiculous given how many
drivers you see risking their life and everyone else’s by texting and talking
on the phone while they drive. These
behaviors are much more dangerous than driving fast, but people understand
intuitively that speed can kill them and so they rarely drive faster than they
can control their vehicle. Texting and
talking on the other hand are activities that few drivers recognize as deadly
at this time in our cultural development.
That will change in time. When
traffic engineers choose a speed limit that suits 85% of the drivers, then the
police can then more easily spot the speeding outliers who need to be
controlled by ticketing.
But wait, isn’t driving slower always safer? Well no.
It turns out that in both state
and federal studies it is consistently shown that the drivers most likely to
get into accidents are those traveling significantly below the average speed of
the other drivers on the road. If you
are on the highway driving 10 mph slower than the average vehicle speed then you are more likely to be involved in an
accident than if you were driving 10 mph faster than the average speed.
One thing that everyone should remember when driving at
higher speeds is that that you need to allow significantly longer stopping
distances between you and the car in front of you. It will take you nearly twice as far to stop
at 85 mph as it will at 60 mph. So increased speed limits need to be
accompanied by some changes in driver habits and that doesn’t always happen.
If those driving on highways at speeds above the speed limit
are less likely to get into accidents than those traveling at speeds below the
speed limit, then why do auto insurance companies charge you higher rates if
you have speeding tickets on your driving record? In my opinion this is an example of archaic
rules still on the books. Here in NC it
is a bit ironic that you can get your ticket reduced to less than 10 miles over
the speed limit and have your insurance points waived. However, if you get a speeding ticket for
going more than 75 mph in NC, which in some cases might be only 6 mph over the
speed limit, then you could face a 4 point surcharge which would increase your
insurance costs dramatically. You can
quickly see that this approach flies in the face of all research and does not make
any actuarial sense at all. I think with
the increased use of on board monitoring systems for auto insurance rates, that
eventually some of the speeding ticket insurance surcharges will be changed or
removed from the books completely.
Clinard Insurance
Group is an independent insurance agency located in lovely Winston Salem,
NC. We insured thousands of families all
across North and South Carolina. If you
need any help with your auto
insurance policy, your homeowners
insurance policy, or your life
insurance, please call our office, toll free, at 877-687-7557. We look forward to answering your questions
and helping you.