(1) The document reports on a study to determine the spot speed of vehicles on a section of the Maitighar-Tinkune Road in Nepal. (2) Data on vehicle speeds was collected manually over the 54m section, with over 290 vehicles observed. (3) Analysis found the 85th percentile speed (the speed at which 85% of vehicles travel at or below) to be 44kmph, while the 50th percentile speed was 37kmph.

1. Title: To determine the spot speed at section of Maitighar-
Tinkune Road.
Objectives:
 To determine the speed distribution of a traffic stream at a specific
location.
 To determine vehicle speed percentiles.
 Determining existing traffic operations and evaluation of traffic
control devices.
 Establishing roadway design elements.
 Monitoring traffic speed trends by systematic ongoing speed
studies.
Introduction:
Speed is an important transportation consideration because it relates to
safety, time, comfort, convenience, and economics. Spot speed studies are
used to determine the speed distribution of a traffic stream at a specific
location. The data gathered in spot speed studies are used to determine
vehicle speed percentiles, which are useful in making many speed-related
decisions. There are two types of speed: the time-mean speed and the space-
mean speed. Space-mean speed is the length of a road section divided by the
average travel time of several vehicles over this specific section. The time-
mean speed (spot speed) is the average spot speed of several vehicles
measured at a given spot.
Theory & concept:
The methods used for conducting spot speed studies can generally be
divided into two main categories:
 Manual
 Automatic
(1) Using road detectors
(2) By radar-based
(3) Using the principles of electronics

2. Data Collection and methodology:
The data is normally based on randomly sampling individual vehicle
speed over short time period.
It depends on observing the time required by vehicle to cover a short distance
of roadway.
Requirements:
• Stop watch.
• Measuring tab.
Figure: Spot Speed Layout
=54m
mm
Time taken by the vehicle to cover a specified distance on a road is measured. The
specified or base distance recommended depends on the speed being measured.
Base distances recommended are as follows:
For Speeds Recommended base distances
Under 40 km/hr 27 m
40-60 km/hr 54 m
>65 km/hr 81 m

3. Observation :
Location: Baneshwor Road
Date: 9/11/2071
Length: 54 m
Weather: Sunny
Road Surface: Asphaltic
Speed
Limit Time(sec) 2W(Motorbike) 3W 4W(Car,Jeep,Van) 4W(Bus, Truck)
26 28 7.48 6.94 7 2 2
28 30 6.94 6.48 6 2 1
30 32 6.48 6.08 9 9 2
32 34 6.08 5.72 11 13 2
34 36 5.72 5.40 11 24 1
36 38 5.40 5.12 16 20 1
38 40 5.12 4.86 23 9 2
40 42 4.86 4.63 18 22
42 44 4.63 4.42 15 13 1
44 46 4.42 4.23 10 11
46 48 4.23 4.05 10 2
48 50 4.05 3.89 4 4 1
50 52 3.89 3.74 2 1
52 54 3.74 3.60 2 1
54 56 3.60 3.47 4
56 58 3.47 3.35 1
Speed Limit(kmph)
Mean
Speed(kmph) Frequency Cumu. Cu. % % of frequency
26 28 27 11 11 3.73 3.73
28 30 29 9 20 6.78 3.05
30 32 31 20 40 13.56 6.78
32 34 33 26 66 22.37 8.81
34 36 35 36 102 34.58 12.20
36 38 37 37 139 47.12 12.54
38 40 39 40 179 60.68 13.56
40 42 41 34 213 72.20 11.53
42 44 43 29 242 82.03 9.83
44 46 45 21 263 89.15 7.12
46 48 47 12 275 93.22 4.07
48 50 49 9 284 96.27 3.05
50 52 51 3 287 97.29 1.02
52 54 53 3 290 98.31 1.02
54 56 55 4 294 99.66 1.36
56 58 57 1 295 100.00 0.34

4.  db0.00
20.00
40.00
60.00
80.00
100.00
120.00
27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57
Mean Speed
50th percentile speed=37 kmph
85th percentile speed=44 kmph
0.00
5.00
10.00
15.00
20.00
25.00
30.00
35.00
40.00
45.00
27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57
Fig: Speed distribution curve
Fig: Graphical analysis of spot speed distribution

5. Conclusion & Result:
Hence,the 85th percentile speed of vehicle at section of Maitighar to
Baneshwor was found to be 44 km/hr.This means that, 85 % of vehicles were
moving within speed of 44 km/hr and remaining 15 % of vehicles exceeded 44
km/hr.
Discussion:
The result that we obtained couldnot be taken as accurate because of
manual method of calculating the speed of vehicles. There might be high chance of
human errors . Due to manual method of recording, the normal distribution curve
wasnot smooth.

6. ADVANCED COLLEGE
OF
ENGINEERING AND MANAGEMENT
Report : 1
To determine the spot speed of road section
Submitted By:
Keshav Adhikari (068/BCE/042)
Krishna Thapa (068/BCE/043)
Kshitz Pandit (068/BCE/045) Submitted To:
Kulin Basnet (068/BCE/046) Department of Civil
Navaraj Bhatta (068/BCE/053)
Date:2071-10-16