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the brakes become effective. This lapse of time depends mainly on the driver’s
reaction but is in the order of
3
/
4
second.
The table below lists the distances to the final stop as a function of the car’s
speed.
These distances presuppose brakes and tyres in perfect condition, a car which is
not overloaded and a dry road surface offering good adhesion. They can be
considerably increased on a wet or oily surface.
As a reminder and in an attempt to avoid serious errors of judgement the
speedometer 6 (fig. 20) is equipped with an indicator annotated “Stopping
distance (dry surface)” controlled by the speedometer needle so that three
numbers are displayed in succession: 80—150--250. These express the total
stopping distances as an order of magnitude on a dry surface at three speeds:
62, 87 and 112 mph (100, 140 and 180 km/h). At high speeds, i.e. in excess of
93 mph (150 km/h), it is advisable not to apply the brakes fully at once: try
instead to foresee the need to slow down as early as possible and to use the
decelerating effect of the engine first.
Cars speed mph/(km/h) 25/(40) 50/(80) 75/(120) 100/(160) 112/(180)
Distance travelled during
reaction time ……………
Distance travelled during
braking…………………...
27 ft
(8.30 m)
34 ft.
(10.30 m)
54 ft.
(1670 m)
134 ft. 6 in.
(41 m)
82 ft.
(25 m)
305 ft.
(93 m)
110 ft.
(33.40 m)
550 ft.
(165 m)
122 ft.
(37.50 m)
680 ft.
(208 m)
Total stopping distance .. 60 ft.
(1860 m)
190 ft.
(5770 m)
390 ft. (118
m)
650 ft.
(19840 m)
820 ft.
(24550 m)
35