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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?Leave a comment:
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Then some of your data (or the data units) don't make sense.Originally posted by tazdevil View Post
If the data is 300 seconds worth, then the GapTime cannot be 400 seconds.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.Leave a comment:
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Yup lots more courtesy of wireshark but will it help? Another example below which produces a headway figure of 21.36. Whether the headway is time or space I'm not sure but some bright person around here should be able to suss it?Originally posted by NotAllThere View Post
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>Leave a comment:
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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.Leave a comment:
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Are the 3 classes actually 3 lanes on the road, or 3 types of vehicle?Leave a comment:
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Originally posted by The Castle Cary Fairy View PostHTH BIDIThe 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.Leave a comment:
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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.Leave a comment:
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