This document details a study to determine the operating speed of vehicles on a road in Dhaka, Bangladesh. Researchers timed vehicles traveling over an 80-foot segment to calculate average speeds and then the operating speed for different vehicle types. The operating speed for motorized vehicles was found to be 15.22 mph. Level of service analysis showed traffic would be in a state of forced flow or congestion at this speed. The conclusion recommends introducing traffic calming measures to address delays and congestion.

1. Determination of
Operating Speed

2. ROADMAP 2
1 3 5
6
4
2
Introduction Methodology Discussion
Objective &
Background
Result Conclusion

3. Fundament
al Design
Criteria
• Operating
Speed
• Free flow
Speed
• Running
Speed
• Average
Speed
Operating
speed
Free flow
condition
Key Role
for
controlling
Geometric
Design
Introduction

4. 4
Spot Speed
» Instantaneous speed of a vehicle
» Calculated using time required to
pass a short distance

5. 5
Project Background
» To determine the appropriate locations for modifying speed
limit regulations
» Speed-profile models can be introduced
» Obtaining driver attitudes and behaviors
» Shows impact in roadway capacity

6. 6
Study Area
» Panthapath
» Latitude: 23045’03” N
» Longitude: 90023’18” E
»

7. Procedure 7
Selected a 80-ft straight and level stretch of road with free-flowing traffic
Divided into two teams stationed 80-ft apart to time vehicles
Observed six types of vehicles: Motorbikes, Cars, CNGs, Pickup Van,Rickshaw
& Bicycle
Used a stopwatch or timer to record the time it took for each vehicle to travel
80-ft
Repeated the process for several vehicles of each type and calculated the
mean time for each vehicle
Divided the length of the road segment (80-ft) by the mean time of each
vehicle to calculate the operating speed

8. Data Collection 8
Private Car 5 80 5.06 15.81 24.27
15.22
80 2.72 29.41
80 3.53 22.66
80 3.16 25.32
80 2.84 28.17
CNG 5 80 3.28 24.39 23.93
80 3.28 24.39
80 3.62 22.10
80 2.97 26.94
80 3.66 21.86
Pickup Van 5 80 4.06 19.70 18.76
80 5.32 15.04
80 4.56 17.54
80 3.84 20.83
80 3.87 20.67
Motor Bike 5 80 3.59 22.28 22.32
80 3.38 23.67
80 3.03 26.40
80 3.94 20.30
80 4.22 18.96

9. Results
» Operating Speed =
∑Number of vehicles ∗Avg. Speed
Total no. of vehicle
» The operating speed for motorized vehicle is 15.22 mph
9

10. Level of Service - LOS 10
» Term used to describe the quality
provided by a transportation system
or facility

11. Level of Service - LOS 11
» Forced flow
» Worst condition
LOS F

12. 12
15.22
Motorized
11.84
Motorized and
Non-motorized
8.45
Non-motorized
Discussion

13. 13
Conclusion
» Introduce traffic calming measures
» Significant delay and congestion
» Highly undesirable and inefficient

14. » Levels of Service for Road Transportation | The Geography of Transport
Systems (transportgeography.org)
» Microsoft Word - LOS Definitions.doc (virginiadot.org) Microsoft Word -
LOS Definitions.doc (virginiadot.org)
14
Reference

15. 15
Thank you!
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