This document discusses the design and implementation of traffic signals at an intersection in Bahalgarh, India. It first provides an overview of why traffic signals are needed, noting they help direct alternating traffic flow, improve safety, and reduce accidents and delays. It then details the methodology used in the traffic signal design project, including analyzing traffic volumes at the intersection over different time periods, and using various methods recommended by the Indian Roads Congress to design the traffic signal timing and cycle. The document aims to reduce conflicts and ensure the orderly and safe flow of traffic through the intersection.

1. Traffic Signals
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2. Design of Traffic Signal
at Bahalgarh Chowk
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3. Satellite view of Bahalgarh:
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4. 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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5. Traffic Signals – Why?
Reduce delay
Improve safety
Help low volume roads
Orderly flow of traffic
Reduce the frequency of
accidents

6. • 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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7. • 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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8. 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

9. 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

10. TYPES OF TRAFFIC SIGNAL:
• Traffic control signals
1) Fixed-time signal
2) Manually operated signal
3) Automatic signal
• Pedestrian signal
• Special traffic signal
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11. 11
METHODOLOGY
 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

12. 12
Analysis of Traffic Volume:
130
144
53
187
112
60
367
660
104
67
860
130
4:00-4:30

13. 13
166
174
76
247
148
80
292
786
108
50
775
145
4:30-5:00

14. 14
188
196
71
202
146
76
334
834
101
72
883
165
5:00-5:30

15. 15
179
182
67
191
157
59
94
351
842
77
852
148
5:30-6:00

16. 16
6:00-6:30
152
165
69
173
146
64
352
841
107
56
827
180

17. 17
153
201
70
177
148
60
80
357
847
49
811
147
6:30-7:00

18. 18
160
201
68
211
166
88
304
767
119
77
753
171
2:00-2:30

19. 19
146
149
61
186
119
66
97
303
731
53
790
108
2:30-3:00

20. Thank You
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