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Stopping Distances

 

Stopping distances & reaction times(.75second) for Motorcycles.
http://www.begin-motorcycling.co.uk/elc2.htm   

This is the distance your motorcycle travels from the moment you realise you must brake to the moment your machine stops.

Always ride so that you can stop safely within the distance you can see to be clear.

Stopping distance divides into 'thinking distance' and braking distance.

Thinking distance is from the point where you see the hazard to the point where you brake. This distance will vary from rider to rider according to their reaction times.

An alert and fit rider needs 0.75 of a second thinking time. That means that at 50 mph you'll travel 15 metres (about 50 feet) before you begin to brake.

Motorcycle Stopping Tests…DISTANCE VERSUS TIME:

The objective of emergency braking must be to reduce as much speed in the shortest distance possible and not in the least elapsed time. Although there is a correlation between braking distance and time, it is not absolute. Thus the quickest stop from 100 km/h recorded during these tests lasted only 2.70 seconds but covered 37.68 metres. The shortest stopping distance recorded was 36.95 metres in an elapsed time of 2.75 seconds.

This slight difference highlights the importance of an effective start to the braking procedure at the moment when the distances traveled are greatest. www.fmq.qc.ca/pdf/amorce-freinage_eng.pdf   

MOTORCYCLE EMERGENCY BRAKING: NOTE: RECOMMENDATION CONCERNING THE CLUTCH

In light of these figures we recommend completely disengaging during an emergency stop.

   

100 km/h to 0

80 km/h to 0

Variable

(G)

metres (m)

seconds (s)

metres (m)

seconds (s)

Clutch disengaged

0.929

39.95

3.08

23.41

1.72

With downshifting

0.891

43.17

3.21

24.97

1.81

Clutch engaged

0.889

41.51

3.21

24.50

1.78

CLUTCH DISENGAGED
In the 11 passes for which the rider was instructed to declutch, that is to pull the clutch lever and disengage the rear wheel from the engine, the mean stopping distance was 39.95 metres.

CLUTCH ENGAGED
With the goal of reducing the chance of locking the rear wheel and its negative consequences, certain observers suggested not declutching during a hard stop. The rear wheel thus remaining coupled mechanically to the engine is less susceptible to lock.

The mean braking distance recorded over 35 passes with the clutch engaged was 41.51 metres.

Cars Stopping Tests…Reaction Time plus Stopping Distance:
www.sdt.com.au/STOPPINGDISTANCE.htm
These first 2 components of stopping distance are human factors and as such can be effected by tiredness, alcohol, fatigue and concentration levels. A perception and reaction time of 3 or 4 seconds is possible. 4 seconds at 100 km/hr means the car travels 110 metres before the brakes are applied.

NMRA Stopping Distances Tests for Cars:
www.nrma.com.au/pub/nrma/motor/car-research/
stopdistance.shtml

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