PAVEMENT DESIGN AND CONSIDERATION LAY -BYS REQUIRED FOR THE BUS STOPS

The design of a pavement is governed by the traffic density, ie the number of vehicles using the road during the peak hours and the maximum wheel load. The daily traffic volume is about 8 to 10 times the maximum hourly volume In addition to this the character of the traffic and the speed of the vehicles are also major consideration. The rate of traffic increase per annum is also to be considered and which may vary from ten to twenty percent in a developing country like India. The traffic Counts -Equivalency factor for vehicles per day both directions must be considered for the desired road capacity after due evaluation of the conversion into equivalent passanger car unit for counting and basic capacity of a traffic lane is the maximum number of passenger cars that can pass a given point on a lane or road way during the course of one hour for which the traffic capacity of two lane road at peak hours should not be more than 1500 passanger vehicles per hour. It is also necessary to provide lay-bye on important roads required for the temporary parking Bays should also be provided for bus stops for which a space of 30into 3 meters is sufficient for lay--bys . Thickness of pavement is increased for heavier loads and a larger traffic volume of traffic .