Download - Traffic signals by Aman Rdr
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Traffic Signals
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Design of Traffic Signal at Bahalgarh Chowk
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Satellite view of Bahalgarh:3
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OVERVIEW:
• Traffic signals are controlled devices which could alternatively direct the traffic to stop and proceed at intersection using red and green traffic light signals automatically.
• The main requirements of traffic signals are to draw attention, provide meaning and time to respond and to have minimum waste of time.
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Reduce delayImprove safetyHelp low volume roadsOrderly flow of trafficReduce the frequency of accidents
Traffic Signals – Why?
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• Conflicting traffic movements, make roadway intersections unsafe for vehicles and pedestrians
• Intersections are a major source of crashes and vehicle delay (as vehicles yield to avoid conflicts with other vehicles).
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• Most roadway intersections are not signalized due to low traffic volumes and adequate sight distances.
• At some point, traffic volumes and crash frequency/severity (and other factors) reach a level that warrant the installation of traffic signals.
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Traffic Signals : Advantages
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• Ensures orderly movement of traffic in all directions
• Provisions for the progressive flow of traffic in a signal-system corridor
• Provisions for side-street vehicles to enter the traffic stream
• Provisions for pedestrians to cross the street safely
• Potential reduction of accidents, conflicts ensuring safety
• Possible improvements in capacity, and• Possible reductions in delay
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Traffic Signals : Disadvantages
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• Large stop time delay• Complex signal design problems
The possible effects of a poorly-timed traffic signal :– increase in vehicle delay,– increase vehicle crashes (particularly rear-end
crashes)– disruption to traffic progression
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TYPES OF TRAFFIC SIGNAL:
• Traff ic control signals 1) Fixed-time signal 2) Manually operated signal 3) Automatic signal• Pedestrian signal• Special traffic signal
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Requirement of traffic signal Warrants for traffic control signal installation recommended by IRC Analysis of traffic volume Design of traffic signal by following methods: Approximate method IRC method Check by webster’s method
METHODOLOGY
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130144 53
187112 60
367660104
67860130
Analysis of Traffic Volume:
4:00-4:30
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166174 76
247148 80
292786108
50775145
4:30-5:00
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188196 71
202146 76
334834101
72883165
5:00-5:30
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179182 67
191157 59
35184294
77852148
5:30-6:00
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6:00-6:30
152165 69
173146 64
352841107
56827180
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153201 70
177148 60
35784780
49811147
6:30-7:00
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160201 68
211166 88
304767119
77753171
2:00-2:30
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146149 61
186119 66
30373197
53790108
2:30-3:00
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Thank You
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