Unit 2 sec 2.4
Developing the models further
21 October 2015
23:45
One of the
most significant factors could be the time it takes the driver to react to a
hazard. If the driver is not alert or is distracted in some way, then thinking
distance could increase substantially, making the overall stopping distance
much greater than that suggested by the models in the highway code.
Taking account of
these additional factors would involve going around the modelling cycle again,
developing the mathematical description to include these new assumptions and
checking how the new model matches reality.
It may not be easy
to remember or visualise the recommended stopping distances, so the role that
it easier to apply is desirable. Whereas at speeds greater than this, the
distance model gives the longer gap.
To make the rule
based on time that produced a similar gaps to those of the distance model at
the typical motorway speeds, a three- second rule would produce much larger
gaps than the distance model at lower speeds. This time model is an
approximation to the distance model.
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