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Transpo Engineering

formulas and terms for transportation engineering

QuestionAnswer
Severity ratio formlua ( fatality + injury ) / ( fatality + injury + property damage)
formula for Accident Rate for 100M vehicles per mile of travel R = ( A · 100x10⁶ ) / ( ADT · N · 365 · L )
formula for Accident Rate for 1M vehicles per entry at intersection R = A · 10⁶ / ( ADT · N · 365 )
peak hour factor formla PHF = q / qₘₐₓ
design hourly volume formla PHV / PHF
rate of flow formla q = kuₛ
density formula k = n / d
average space headway (spacing) formula s = 1 / k = d / n
average time headway formla 1 / q
harmonic mean of the speeds of vehicles passing a point on a highway during an interval of time space mean speed
space mean speed formula 𝓊ₛ = ∑d / ∑t
arithmetic mean of the speeds of vehicles passing a point on a highway during an interval of time time mean speed
time mean speed formula 𝓊ₛ = ∑(d/t) / n
volume of traffic that uses approach, lane, or lane group during the hour of the day that observes the highest traffic volumes for an intersection peak hour volume
time intervals considered for stopping sight distance perception-reaction time and braking time
time for the driver to perceive the hazard perception time
time for the driver to react reaction time
time to stop after the brakes are applied braking time
stopping sight distance formula Vt + [ v² / g( f ± G ) ]
brake efficiency EF = f/ fₐᵥₑ
braking distance ( vᵢ² - vf² ) / [ 2g( ( f ± G ) ]
define each variable in the formula Vt + [ v² / g( f ± G ) ] V = speed t = perception-reaction time f = skid resistance/coeff. of friction G = slope of roadway
Created by: user-1826018
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