Reaction time Reaction
time
Time of reaction of the driver depends on degree of its readiness, a physical
and emotional condition. The skilled driver reacts to situation change on road
almost unconsciously and instantly. Painful or the depression, exhaustion, a drunken
state considerably increase reaction time. The age, a sense of responsibility,
intensity of traffic, a condition of road and many other factors also influence
reaction time. It is considered to be that at the skilled unwearied driver reaction
time averages 0,8 with.
Time of operation of brakes depends on their design
and a condition. At modern cars it averages 0,3 with.
 The
brake way depends on a technical condition of brakes, speed of movement
of the car prior to the beginning of braking and from factor of coupling of wheels
with road. Thus the size of a brake way is directly proportional to a square of
speed at which braking, and inversely proportional to factor of coupling of wheels
with road has begun. It means that the increase in speed twice causes increase
in a brake way four times, and on the road covered with ice, a brake way to five-six
times more, than a brake way on dry асфальтобетонном a covering.
При скорости 90 км/ч остановочный путь даже на сухом асфальтобетонном At
speed of 90 km/h the stopping way even on dry асфальтобетонном a covering reaches
90 m, and At a glaze ice the stopping way on the big speeds increases by damp
- 140 m. much more and at speed of 60 km/h it exceeds 200 m. Calculations for
speeds more than 60 km/h for roads where the coupling factor makes only 0,2-0,1,
are made to show only that in these conditions movement with a great speed is
the extremely dangerous.
 Stop
- the full termination of movement, is carried out by pressing a pedal
of a working brake. Intensity of braking before the stop decreases so that the
car has stopped without "клевка". After a stop in order to avoid spontaneous
movement the car затормаживается a lay brake, and after an engine stop - inclusion
of one of the lowest transfers in transmission.
Lay brake intended
for deduction of the car, at a stop, in exceptional cases (for example, at refusal
of a working brake) can be used and for braking in movement. However to use it
in such cases it is necessary skilfully. First, it is impossible to forget
that a lay brake затормаживаются only back wheels and consequently efficiency
of braking by it is much worse, than to workers. Secondly, sharp inclusion
of a lay brake at high speed of movement often leads to blocking of back wheels
and drift. At last, at braking by a lay brake the stoplight that is fraught with
arrival on your car of the vehicle going behind does not light up.
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