By pass or ring roads are to be constructed to avoid traffic congestion in the city area due to mixing of through traffic with the local traffic of that city.
Segregation in relation to speed is done by providing footpaths for pedestrians, cycle tracks for cyclist and separate lanes for slow and fast moving traffic.
Segregation in relation to directions is done by one way traffic restrictions.
Segregation in relation to grade is done by constructing fly-overs when two roads intersect at right angles and trumpt type for T junctions.
Segregation in relation to time is done by providing traffic control signals.
Purposes.
To separate the incoming and outgoing traffic.
To increase capacity of traffic lanes.
To increase the speed of vehicles.
To ensure more uniform use of the entire roadway width.
To decrease the number of accidents.
