ROAD CAPACITY HAS BEEN RELATED TO, EQUIVALENCY FACTOR FOR VEHICLES , FOR WHICH CONSTRUCTION AGENCIES ARE RESPONSIBLE TO FOLLOW TRAFFIC COUNTS , DATA REPORT.

The state governments and the Government of India as well as the National Highway Authority of India must verify the number of vehicles and its evaluation based on the Traffic Counts equivalency factor for vehicles and basic capacity of a traffic lane is the maximum number of passenger cars that can pass a given point on a lane or roadway during one hour under the most nearly ideal road way and traffic conditions that can possibly be attained and maintained that type of the Road and Counting is done at intersections and width is taken kerb to kerb . Portable (electronic) recording devices have been developed which are laid across the roadway and they measure the axle weight, spacing and speeds of vehicles in motion .As for as possible the government is responsible to upgrade the road capacity according to the capacity of the Road described as below (1) Single -lane,3.75 Mt carriage way with earth shoulders --capacity 1000 (2) Single -lane with hard shoulders one metre wide --2500 capacity (3) Two lane 7.0 Mt carriage way,10000(4) 5.5 Mt carriage way --5000 (5) Four lane divided highway -20000to 30000 capacity.It is traffic count equivalency factor for vehicles per day (both directions) .Since the road traffic is composed of different types of vehicles it is converted into equivalent passenger car unit for counting as described:-- Passengers car ,tempo,autorickshaw -1 Cycle ,motor cycle or scooter -0.5 ,Truck ,bus , tractor -tailer --3,Horse drawn vehicle --4 and Bullack  cart --6to 8 .Commercial vehicle include all such vehicles except light delivery vans and three wheeled vehicles .Roads carrying heavy indivisible loads should be designed as for very heavy traffic.Three lane roads offers only limited advantage over the two lane roads ,and are unsafe where the passing sight distance can not be provided.Four lane roads should invariably be provided with median strips.