Axle Load studies is an effective way to compare the damaging effect of traffic on roads. This survey includes to measure the complete spectrum of axle loads and calculate the appropriate equivalence& damaging factors. It is carried out with the primary objective of studying the loading pattern of commercial vehicles along the study corridor. The results will also be useful for calculating the MSA, and Pavement design.
RSM conducts Axle load survey in the dynamic pattern, portable weighbridges are often used for weighing. Axles’loads are measured by stopping the vehicle or diverting it from the traffic lane. we consider the two traffic directions separately, as it is very rare that the traffic loading is similar for the two directions of traffic. Very often there is a significant difference in loading between the two directions of traffic. An axle load survey among other things give the average vehicle equivalent factors (VEF) for a vehicle category and cumulative axle load distribution.
During an axle load survey, it is important that all vehicles above a gross weight of 5.0 tons are weighed. This applies whether they are empty, partly or fully loaded.
The accuracy of the weighing procedure will basically depend on the following
* the gradient of slope or plane of the weighed axle;
* the wheelbase, the spacing between the dual wheels and the equality in tire pressure and the wear and tear of the tires;
* the height of the load above the center of the axle
Our Procedures for weighing
The axle load survey shift team consists normally six people and conduct a survey using mobile weighbridges, depending on whether the scale reading is recorded on the scale itself or from an electronic display placed in front of the recording officer, similar to those for the stationary weighbridges.
The two flagmen (traffic controllers) stand on the road where oncoming traffic is clearly visible to them, wearing reflective traffic safety vests and during the night they are equipped with a flash torch showing a red light. The flagmen are stationed at 30 meters on either side of the weighbridge.
The random selection of vehicles for axle load measurement, ensuring a suitable sample for each category of commercial vehicles consisting of overloaded and empty vehicles. Surveyors request the vehicles to be weighed to complete stop, for weighing. The traffic controller instructs the truck driver on how to approach the weighbridge at slow walking speed.