Archive for the ‘Transportation Engineering’ Category
Traffic Signs Traffic signs are means of warning, regulating and informing the drivers. Material for traffic signs Material should be such that
Traffic controlling devices The devices which are used to control and regulate the flow of traffic are called traffic controlling devices. These are of three types: Pavement markings. Traffic signs. Traffic signals. Pavement markings Pavement markings are in the form of bands or strips of paints, which are
Lane occupancy Lane occupancy is the ratio of the sum of the lengths of the vehicles to the length of the road section in which those vehicles are present.
Traffic density Traffic density is the number of vehicles occupying a given length of the highway in a traffic lane. It is expressed as vehicle/mile or vehicle/kilometer.
Speed Distance covered by vehicle in unit time is known as speed. Its units are miles/hour or km/hr.
Sight distance The clear distance ahead of vehicle which is visible to the driver is known as sight distance. If suitable sight distance is not provided on the curves, then highway become accidential spot.
Super Elevation Whenever on roads, curve has to be made, outer edge of the road on the curve is raised as compared to the inner edge. This is known as super elevation.
Road Camber The convexity or curvature of the road to avoid staying of water is known as camber. The highest point of camber is known as crown.
Road median Road median is the portion in between the dual carriage way which separates the traffic flow in opposite direction.
Flaky particles The particles whose least dimension is less than 0.6 times the mean size dimensions. Elongated particles The particles whose greatest dimension is greater than