12 Transportation · 12.1 Transportation planning
12.1.7 Intersections: conflict points, rotaries, signals and grade-separated interchanges
An intersection is where streams of traffic meet and conflict; planners control those conflicts by separating them in space (islands, rotaries, interchanges) or in time (signals), choosing the type by traffic volume, land and cost.
- MPSC ATP
- Standard level
- 8 min read
- Full course
Key terms
- intersection
- conflict points
- crossing
- merging
- diverging
- channelisation
- traffic island
- rotary
- roundabout
- IRC:65-1976
- weaving length
- Wardrop formula
- traffic signal
- Webster method
- cycle length
- lost time
- saturation flow
- IRC:93-1985
- signal coordination
- grade separation
- interchange
- trumpet
- diamond
- cloverleaf
- directional interchange
- flyover
What this note covers
- Core factsFoundation
- ExplainedStandard
- DeeperAdvanced
- Mains writingMains writing
- Common trapsFoundation
- Quick revisionFoundation
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