A cyclist who is concentrating will have a Bicycle Brake Reaction Time of about 2½ seconds to react to 'instigate a response' by squeezing his/her brake levers according to different, previously determined, pressure levels for the front and rear brakes when in an emergency situation.

A Brake Reaction Time of 2½ seconds, which has been used in the below separate formulae for km/p/h and m/p/h on page 41 of  “Guide for the development of bicycle facilities” provided by the 'American Association of state highway and transportation officials' is the mode Bicycle Brake Reaction Time used in most modelling.