Road Construction Machinery
LOS is a scale which defines the operating conditions on highway. It is a measure of the restrictive effects of the increased volume, level of service as proposed by manual ranges from A to F, A is ideal level and F is worst level of service.
Density is low enough that closeness of vehicle do not effect vehicle movement
No usable gap between vehicles, speed is slow,, condition can easily cross over into LOS F region.
Breakdown condition, number of vehicles arriving > number of vehicles leaving, speed is zero.
Where = Correction factor for road width
= Correction factor for heavy vehicle
= Correction factor for driver population
F HV = 1 / ( ( 1 + Pt ( Et - 1 ) + Pb ( Eb - 1 ) + PR ( ER - 1) )
Et, Eb, ER,, Passenger car equivalent for truck, bus and recreational vehicles.
Pt, Pb, PR,, Proportion of respective class vehicles N is the number of lanes in one direction. CJ is the capacity per lane (pcphpl)