I am doing Link evaluation of a road segment. The link segment results shows average speed. Is it time mean speed or space mean speed?
Hey there, i'm pretty sure it's the time mean speed. However, i don't know how to get the space mean speed directly. You could estimate it by estimating the standard deviation of the space mean speed and then transform it.
Alternatively you could use a measurement point and calculate the value by hand.
Best regards
The best way is to measure the average travel time over a road segment. Then you divide by the distance of the measured segment and you have the average speed on a link segment ;-).
If you want to have more details, just export raw data of the travel time of every vehicle, and automate it with a VBA script or just do it in excel. Then you can divide it in time segments to see the evolution of the average speed and their standard deviation.
Hi Umair,
the average speed in the link segments is space mean speed. It is computed by adding up the distances travelled of all vehicles in the segment during all time steps in the measurement interval divided by the sum of all time spent in the segment by all vehicles. The vomule and density values in the segments are also computed according to the generalized definition in time and space (q = sum of all distances travelled / (segment length * measurement interval) and k = sum of all time spent / ...)
Best regards, Peter
Hi,
Just a follow up question: How did you get link segment speed? Also, is it for each individual lane?
Ishtiak Ahmed Getting Link speed is not a big Deal , you can set the Parameters in Result window ..You can Get it for each Lane..
- Badges
- Science topic
- Similar topics
- Engineering
- Civil Engineering
- Transportation Engineering