12 Transportation · 12.1 Transportation planning
12.1.5 Traffic flow theory: speed–flow–density, capacity and level of service
Traffic flow theory links three measures, flow, density and speed, through q = k × v; from it come the ideas of maximum flow (capacity) and level of service, which tell planners how close a road is to breaking down.
- MPSC ATP
- Standard level
- 7 min read
- Full course
Key terms
- traffic flow
- q = kv
- flow
- density
- space-mean speed
- time-mean speed
- harmonic mean
- headway
- spacing
- Greenshields model
- free-flow speed
- jam density
- capacity
- basic capacity
- possible capacity
- practical capacity
- level of service
- LOS A to F
- Highway Capacity Manual
- Indo-HCM
- v/c ratio
- shock wave
- design service volume
What this note covers
- Core factsFoundation
- ExplainedStandard
- DeeperAdvanced
- Mains writingMains writing
- Common trapsFoundation
- Quick revisionFoundation
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