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Reply to: Conversion Challenge
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Previously on "Conversion Challenge"
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OK, can you find a piece of data where you have the headway and there's only 1 class of vehicle?
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Originally posted by tazdevil View PostThree classes of vehicle being small (bikes), medium (cars) and large (trucks).
Code:<Message Type="Data"> <Body Type="IntegratedData" IntervalTime="300" - seconds DataNumber="759" Utc="1524800100" - seconds since 1/1/1970 MilliSeconds="27"> <Zone ZoneId="1" Occupancy="0" Confidence="8" Length="27" HeadWay="678" Density="1"> <Class ClassNr="1" NumVeh="5" Speed="63" GapTime="400" /> <Class ClassNr="2" NumVeh="2" Speed="66" GapTime="408" /> </Zone> </Body> </Message>
If the gap time is 400 milliseconds, that means the vehicles are approx 7 metres apart at 63km/h. Not 7m from rear bumper of one to front of the next, but from front of one to front of the next. For a 6m long truck, that would mean there's 1m between it and the next one.
That's kinda beyond dangerously close.
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Originally posted by NotAllThere View PostDo you have any more data points?
Code:<Message Type="Data"> <Body Type="IntegratedData" IntervalTime="300" DataNumber="765" Utc="1524800400" MilliSeconds="19"> <Zone ZoneId="1" Occupancy="1" Confidence="8" Length="32" HeadWay="376" Density="3"> <Class ClassNr="1" NumVeh="6" Speed="62" GapTime="236" /> <Class ClassNr="2" NumVeh="7" Speed="65" GapTime="218" /> <Class ClassNr="3" NumVeh="1" Speed="60" GapTime="130" /> </Zone> </Body> </Message>
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I assume 'headway' means: a measurement of the distance or time between vehicles in a transit system.
Seems to be a solution for Poisson for sure, can I be bothered understanding what the coefficients are..Last edited by scooterscot; 27 April 2018, 13:59.
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Are the 3 classes actually 3 lanes on the road, or 3 types of vehicle?
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Originally posted by The Castle Cary Fairy View PostMaybe a definition of what exactly headway is may provide some pointers?The concept of level of service in highway traffic flow illustrates the differences in the characteristics of the flow which may be examined by a study of the headways between vehicles. Time headways are the time intervals between the passage of successive vehicles past a point on the highway. Because the inverse of the mean time headway is the rate of flow, headways have been described as the fundamental building blocks of traffic flow. When the traffic flow reaches its maximum value then the time headway reaches its minimum value.
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Maybe a definition of what exactly headway is may provide some pointers?
[/Headway is a measurement of the distance or time between vehicles in a transit system. The minimum headway is the shortest such distance or time achievable by a system without a reduction in the speed of vehicles.
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