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2nd
Distance To Brake To Stop Formula
means the two below Figure
19's for 'Metric units' and separately 'English Imperial units' indicate the minimum
Stopping Sight Distance
(separately in
km and then miles),
referred to in this analysis as the
Distance to Brake to Stop,
for various speeds, referred to as V for
velocity, and G for gradient, based on a
bicyclist's brake reaction time
of 2.5 seconds
and a
Coefficient Of Friction
of 0.25
to
account for the poor braking equipment of many bicycles and limited skills of
the majority of road cyclists when under pressure to react to an
emergency braking.
At the bottom of each of the two Figure 19s are the pertinent
formula.
The first part of each of the below two
formula for km p/h and miles/p/h calcs the
Bicycle Brake Reaction Distance.
The second part of each
of the below two formula calcs the
Bicycle Brake Response Distance.
The below two formula are sourced from
Sight Distance
- pg 40
of 'Guide
for development of bicycle facilities"
known as
AASHTO’s “Green Book,” A Policy on Geometric Design of Highways and Streets |
