ROAD CAPACITY MUST HAVE DUE CONSIDERATION OF THE TRAFFIC COUNTS -EQUIVALENCY FACTOR PER DAY (BOTH DIRECTIONS)

IRC 52 -1981 and 70-1977 recommend that village roads should be built up with area nine meters wide and the MDR with road land 18 meters and built up area should be 15 meters where as in the case of other district roads the open area must be 15 meters and the built up area equal to 12 meters and in the case of NH and the SH open area of land should be 24 meters and the built up area 20 meters .The carriage way width in case of the single lane is 3.75 and the two lane 7.0 meters however in case of village roads it should not be less than 3.0 meters .The above road widths are exclusive of the parapets for which usual width of 0.6 meter is necessary to provide the parapets and the road side drain ,each for and design of shoulder is too required as per the schedule under code and specifications The road capacity for single lane,3.75 meter carriage way with earth shoulder may have 1000 and single lane with hard shoulders one meter wide equal to 2500 and two lane ,7.0 meter carriage way 10000 and 5.5 meter carriage way 5000 capacity where as the four -lane divided highway it may have 20000 to 30000 capacity which must be counted on the basis of traffic count -Equivalency factor for vehicles per day (Both directions) .Three lane roads offer 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.