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Accident rate for 100M vehicles per miles of travel in a segment of a highway

Accident rate per million entering vehicles in an intersection

Severity Ratio (S.R.)

rate of flow in vehicles per hour
k is density, U is sms

average center-to-center spacing of cars in meters (S)

Capacity of a single lane (veh/hr) (C)

Sight distance (S) hint: velocity head
denominator interchangeable with braking distance/length of skid mark. G is the grade/slope of the road

Parabolic Summit Curve: L>S

Parabolic Summit Curve: L<S

Parabolic Sag Curve: L>S

Parabolic Sag Curve: L<S

Parabolic Sag Curve: L>S, H and beta are not given

Parabolic Sag Curve: L<S, H and beta are not given

Length for passenger comfort
