Rookie Driver School of Motoring explains stopping distances,
Do you remember the days prior to taking your driving test when the mass of information in the Highway Code became such a blur?
Desperately trying to remember the information contained within regarding road signs and stopping distances.
More recently those taking a driving theory test are given options to
choose from but then they are in metres, feet or car lengths.
Knowing the actual number doesn't actually prove that drivers can relate
this in the real world, i.e. following another vehicle.
The Highway Code has published the same figures since 1946 which has
given the driver plenty of time to memorise the numbers but as modern
cars are capable of stopping in much shorter distances, do those numbers
still have any relevance?
A number of factors affect the vehicles ability to be able to stop
quickly such as tyres, brakes, the road surface, the cars load and
weather conditions. But the one single common factor in any and every
slowing vehicle is the driver.
Driving in 2012 is busy, fast and filled with a mass of hazards that
present themselves at the most inconvenient times which all add to the
drivers overload and reduced ability to stop promptly.
Over the years we have seen a variety of public information adverts in
the media that have been enlightening and filled with graphic detail
that has sometimes neared shock level. During which we've been informed
that when travelling at just 5mph over the 30 mph speed limit, we travel
an extra 7m or 21ft further.
Again, those numbers are great but in my experience, drivers rarely can
tell the distance accurately and it doesn't matter if it's in imperial
or metric measurement.
Back to the Highway Code which shows a typical stopping distance table
which highlights clearly those distances. Simple calculations allow the
driver to work out the stopping distance at a certain speed.
Maths was never my favourite subject at school and I certainly didn't
expect it to be useful as a driver but if you can have the time, there
is a method but only in feet.
Ready, here goes. The overall stopping distance is made up of two parts, thinking distance and
braking distance.
Firstly the easy bit, the thinking distance is simply the same as the speed. e.g.
30 mph = 30 feet
40 mph =40 feet and so on
The braking distance is a little more complicated and goes like this,
Starting at 20 mph (speed) multiply by 1 = 20 feet
Then 30 mph multiply by 1.5 = 45 feet
And 40 mph multiply by 2 = 80 feet and so on.
To calculate the overall distance add the appropriate thinking distance to the braking distance, e.g.
At 30 mph the thinking distance is 30 feet plus braking distance is 45 feet= an overall stopping distance of 75 feet. Phew
Did that make sense? I would suggest a lot less when your actually
travelling at 70 mph on a busy dual carriageway whilst overtaking
another car and a Land Rover pushing you from behind.
Rule 126 of the Highway Code simply suggests;
Drive at a speed that will allow you to stop well within the distance you can see to be clear.
Allow a two second gap between you and the vehicle in front. When the
road is wet, the distance should be doubled and further on an icy road.
In short, wouldn't it be easier to apply the 2 second rule when travelling at speeds in excess of 30mph?
In this case, there are no complicated calculations or searching of the
memory, just count 2 seconds from the car in front passing a stationary
object to when you pass the same object. A useful way to remember this
is to apply the following saying, 'Only a fool breaks the 2 second rule'
, done.
Note this applies on a dry road but must be said twice on a wet road.
The Highways Agency in certain areas such as the A13 stretch of road
between Basildon and Corringham in Essex are making this even easier by
placing arrow on the road. In this case the driver should visibly see 2
arrows between the vehicle they're following.
If this helps the driver to pay more attention to what's happening, this
should have a more positive effect on being able to stop promptly
despite the outdated numbers shown in the Highway Code.
We at Rookie Driver School of Motoring hope you have founf this interesting.
Please email us and let us know what you think.
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