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comparison python/traffic_engineering.py @ 614:5e09583275a4

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Merged Nicolas/trafficintelligence into default
author Mohamed Gomaa <eng.m.gom3a@gmail.com>
date Fri, 05 Dec 2014 12:13:53 -0500
parents 850ed17c7b2f
children 3b13ec964476
comparison
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598:11f96bd08552 614:5e09583275a4
9 9
10 10
11 ######################### 11 #########################
12 # Simulation 12 # Simulation
13 ######################### 13 #########################
14
15 def generateTimeHeadways(meanTimeHeadway, simulationTime):
16 '''Generates the time headways between arrivals
17 given the meanTimeHeadway and the negative exponential distribution
18 over a time interval of length simulationTime (assumed to be in same time unit as headway'''
19 from random import expovariate
20 headways = []
21 totalTime = 0
22 flow = 1/meanTimeHeadway
23 while totalTime < simulationTime:
24 h = expovariate(flow)
25 headways.append(h)
26 totalTime += h
27 return headways
14 28
15 class Vehicle: 29 class Vehicle:
16 '''Generic vehicle class 30 '''Generic vehicle class
17 1D coordinates for now''' 31 1D coordinates for now'''
18 class PredictedTrajectory1D(prediction.PredictedTrajectory): 32 class PredictedTrajectory1D(prediction.PredictedTrajectory):
157 if sum(proportions) == 1: 171 if sum(proportions) == 1:
158 self.volume = volume 172 self.volume = volume
159 self.types = types 173 self.types = types
160 self.proportions = proportions 174 self.proportions = proportions
161 self.equivalents = equivalents 175 self.equivalents = equivalents
162 self.nLanes = nLanes # unused 176 self.nLanes = nLanes
163 else: 177 else:
164 print('Proportions do not sum to 1') 178 print('Proportions do not sum to 1')
165 pass 179 pass
180
181 def checkProtected(self, opposedThroughMvt):
182 '''Checks if this left movement should be protected,
183 ie if one of the main two conditions on left turn is verified'''
184 return self.volume >= 200 or self.volume*opposedThroughMvt.volume/opposedThroughMvt.nLanes > 50000
166 185
167 def getPCUVolume(self): 186 def getPCUVolume(self):
168 '''Returns the passenger-car equivalent for the input volume''' 187 '''Returns the passenger-car equivalent for the input volume'''
169 v = 0 188 v = 0
170 for p, e in zip(self.proportions, self.equivalents): 189 for p, e in zip(self.proportions, self.equivalents):
180 self.mvtEquivalent = mvtEquivalent 199 self.mvtEquivalent = mvtEquivalent
181 200
182 def getTVUVolume(self): 201 def getTVUVolume(self):
183 return self.mvtEquivalent*self.volume.getPCUVolume() 202 return self.mvtEquivalent*self.volume.getPCUVolume()
184 203
185 class IntersectionApproach: # should probably not be used
186 def __init__(self, leftTurnVolume, throughVolume, rightTurnVolume):
187 self.leftTurnVolume = leftTurnVolume
188 self.throughVolume = throughVolume
189 self.rightTurnVolume = rightTurnVolume
190
191 def getTVUVolume(self, leftTurnEquivalent = 1, throughEquivalent = 1, rightTurnEquivalent = 1):
192 return self.leftTurnVolume.getPCUVolume()*leftTurnEquivalent+self.throughVolume.getPCUVolume()*throughEquivalent+self.rightTurnVolume.getPCUVolume()*rightTurnEquivalent
193
194 class LaneGroup: 204 class LaneGroup:
195 '''Class that represents a group of mouvements''' 205 '''Class that represents a group of mouvements'''
196 206
197 def __init__(self, movements, nLanes): 207 def __init__(self, movements, nLanes):
198 self.movements = movements 208 self.movements = movements
201 def getTVUVolume(self): 211 def getTVUVolume(self):
202 return sum([mvt.getTVUVolume() for mvt in self.movements]) 212 return sum([mvt.getTVUVolume() for mvt in self.movements])
203 213
204 def getCharge(self, saturationVolume): 214 def getCharge(self, saturationVolume):
205 return self.getTVUVolume()/(self.nLanes*saturationVolume) 215 return self.getTVUVolume()/(self.nLanes*saturationVolume)
206
207 def checkProtectedLeftTurn(leftMvt, opposedThroughMvt):
208 '''Checks if one of the main two conditions on left turn is verified
209 The lane groups should contain left and through movement'''
210 return leftMvt.volume >= 200 or leftMvt.volume*opposedThroughMvt.volume/opposedThroughMvt.nLanes > 50000
211 216
212 def optimalCycle(lostTime, criticalCharge): 217 def optimalCycle(lostTime, criticalCharge):
213 return (1.5*lostTime+5)/(1-criticalCharge) 218 return (1.5*lostTime+5)/(1-criticalCharge)
214 219
215 def minimumCycle(lostTime, criticalCharge, degreeSaturation=1.): 220 def minimumCycle(lostTime, criticalCharge, degreeSaturation=1.):
224 self.phases = phases 229 self.phases = phases
225 self.lostTime = lostTime 230 self.lostTime = lostTime
226 self.saturationVolume = saturationVolume 231 self.saturationVolume = saturationVolume
227 232
228 def computeCriticalCharges(self): 233 def computeCriticalCharges(self):
229 self.criticalCharges = [] 234 self.criticalCharges = [max([lg.getCharge(self.saturationVolume) for lg in phase]) for phase in self.phases]
230 for phase in self.phases:
231 self.criticalCharges.append(max([lg.getCharge(self.saturationVolume) for lg in phase]))
232 self.criticalCharge = sum(self.criticalCharges) 235 self.criticalCharge = sum(self.criticalCharges)
233 236
234 def computeOptimalCycle(self): 237 def computeOptimalCycle(self):
235 self.computeCriticalCharges() 238 self.computeCriticalCharges()
236 self.C = optimalCycle(self.lostTime, self.criticalCharge) 239 self.C = optimalCycle(self.lostTime, self.criticalCharge)
240 self.computeCriticalCharges() 243 self.computeCriticalCharges()
241 self.C = minimumCycle(self.lostTime, self.criticalCharge, degreeSaturation) 244 self.C = minimumCycle(self.lostTime, self.criticalCharge, degreeSaturation)
242 return self.C 245 return self.C
243 246
244 def computeEffectiveGreen(self): 247 def computeEffectiveGreen(self):
245 from numpy import round 248 #from numpy import round
246 #self.computeCycle() # in case it was not done before 249 #self.computeCycle() # in case it was not done before
247 effectiveGreenTime = self.C-self.lostTime 250 effectiveGreenTime = self.C-self.lostTime
248 self.effectiveGreens = [round(c*effectiveGreenTime/self.criticalCharge,1) for c in self.criticalCharges] 251 self.effectiveGreens = [round(c*effectiveGreenTime/self.criticalCharge,1) for c in self.criticalCharges]
249 return self.effectiveGreens 252 return self.effectiveGreens
250 253
261 264
262 def uniformDelay(cycleLength, effectiveGreen, saturationDegree): 265 def uniformDelay(cycleLength, effectiveGreen, saturationDegree):
263 '''Computes the uniform delay''' 266 '''Computes the uniform delay'''
264 return 0.5*cycleLength*(1-float(effectiveGreen)/cycleLength)/(1-float(effectiveGreen*saturationDegree)/cycleLength) 267 return 0.5*cycleLength*(1-float(effectiveGreen)/cycleLength)/(1-float(effectiveGreen*saturationDegree)/cycleLength)
265 268
269 def overflowDelay(T, X, c, k=0.5, I=1):
270 '''Computes the overflow delay (HCM)
271 T in hours
272 c capacity of the lane group
273 k default for fixed time signal
274 I=1 for isolated intersection (Poisson arrival)'''
275 from math import sqrt
276 return 900*T*(X - 1 + sqrt((X - 1)**2 + 8*k*I*X/(c*T)))
277
266 ######################### 278 #########################
267 # misc 279 # misc
268 ######################### 280 #########################
269 281
270 def timeChangingSpeed(v0, vf, a, TPR): 282 def timeChangingSpeed(v0, vf, a, TPR):