Page 101 - HIGHWAY ENGINEERING LABORATORY_FLIP BUILDER

Page :
WORK INSTRUCTION
Edition :

Checking No.
SPEED AND DELAY STUDY
(Reference Standard: Effective Date:
CIVIL ENGINEERING AASHTO. 2001)

JKA/ DCC30112/ 2021 Amendment Date:

1.0 OBJECTIVE OF EXPERIMENT:

This study helps to determine the amount of time required to travel from one point to
another on a given route

2.0 SUMMARY OF THEORY:

The information assembled as part of this travel time and delay study forms a baseline for
future assessment.. Often, information may also be collected on the locations, durations,
and causes of delays. Good indication of the level of service and identifying problem
locations.

A travel time study determines the average time required and also the amount of delay
caused on a given route. Delay is the extra time spent by drivers against their

expectation. Data obtained from travel time and delay studies give a good indication of
the level of service on the study section. These data aids the traffic engineer in
identifying locations like presence of intersections, which may require special attention in
order to improve the overall flow of traffic on the route.

There can be different forms of delay depending on location:
1. Stopped time delay It is the delay during which the vehicles is at rest

2. Approach delay It is due to deceleration to and acceleration from a stop to stopped
time delay.
3. Time-in-queue delay It is the time between a vehicle joining the end of the queue at

a signalized or stop-controlled intersection and the tie it crosses the intersection (stop
line).
4. Control delay (or fixed delay)It is the delay caused by controlled device such as

signals, includes both approach delay and time-in-queue delay.
5. Operational delay It is the delay caused due to impedance of other traffic.

Higway Engineering Laboratory page 86