V. TRAFFIC AND TRANSPORTATION

2. SAFETY AND ENVIRONMENT

C. NEW PROJECTS
5. A Study of Spot Speed in City and Rural Sections of Highways
Duration

April 2005 to December 2005
(i) National Transportation Planning and Research Centre (NATPAC), Thiruvananthapuram (R)
(ii) Kerala State Transport Project/PWD, Kerala (S)

 

Scope and Objectives

The objectives of the study are to measure the spot speed at different locations during peak hours and school opening / closing times, to compare the spot speeds at different locations like school zone, hospital zone, commercial zone etc. and to suggest measures to control and regulate speeds in front of various zones

 
Methodology
(a) Measurement of Spot Speed
The simplest method of determining the spot speed is the direct timing procedure. Two reference points are marked on the pavement at a suitable distance apart and an observer starts stopwatch as a vehicle touches the starting point and stops the watch when the vehicle touches the end point. From the known distance and measured time intervals, spot speed is calculated

The recommended base lengths for different speed of traffic stream are given below in Table.

Recommended base lengths for spot speed survey
Average Speed of Traffic Stream (K.P.H)
Base Length (Meters)
Less than 40
27
40 to 65
54
Greater than 65
81


(b) Volume Count
Manual method is used for counting the classified traffic volume, which was converted into Passenger Car Units (PCU).
 
Interim Conclusions
The findings of the study are:

• Average spot speed at School zone in Trivandrum City is 36 km/h during peak hour and 40 km/h during school timings

• The spot speed at school zone in suburban area is 48km/h

• The spot speed at hospital zone in rural section is 37 km/h

• The spot speed at business zone is 47km/h