Mercurial Hosting > traffic-intelligence
changeset 493:850ed17c7b2f
added some computation of delay
| author | Nicolas Saunier <nicolas.saunier@polymtl.ca> |
|---|---|
| date | Wed, 23 Apr 2014 23:35:52 -0400 |
| parents | 30fb60428e09 |
| children | 41a72146685e 82c06ad62254 6ebdd90ce3ee |
| files | python/traffic_engineering.py |
| diffstat | 1 files changed, 9 insertions(+), 0 deletions(-) [+] |
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--- a/python/traffic_engineering.py Wed Apr 23 16:20:40 2014 -0400 +++ b/python/traffic_engineering.py Wed Apr 23 23:35:52 2014 -0400 @@ -266,6 +266,15 @@ '''Computes the uniform delay''' return 0.5*cycleLength*(1-float(effectiveGreen)/cycleLength)/(1-float(effectiveGreen*saturationDegree)/cycleLength) +def overflowDelay(T, X, c, k=0.5, I=1): + '''Computes the overflow delay (HCM) + T in hours + c capacity of the lane group + k default for fixed time signal + I=1 for isolated intersection (Poisson arrival)''' + from math import sqrt + return 900*T*(X - 1 + sqrt((X - 1)**2 + 8*k*I*X/(c*T))) + ######################### # misc #########################