Prequels (Traffic Overlay)

Grid-based Traffic Overlays can make use of Prequels rather than Attributes of roads to base traffic intensities for calculations on.

Name	Prequel	Underlying data	Unit	Range	No data	Description
Buses	BUS	Traffic Prequel	vehicles/h	0 - max value	0	Amount of bus traffic in any given location.
Cars	CAR	Traffic Prequel	vehicles/h	0 - max value	0	Amount of car traffic in any given location.
Trucks	TRUCK	Traffic Prequel	vehicles/h	0 - max value	0	Amount of truck traffic in any given location.
Vans	VAN	Traffic Prequel	vehicles/h	0 - max value	0	Amount of van traffic in any given location.

Notes

• A Prequel with a single timeframe will mean that value applies to all hours of the day. A Prequel with multiple timeframes is assumed to have 24 timeframes, with each timeframe representing a single hour of the day.