Authors :
Fikedu Rage Faye
Volume/Issue :
Volume 5 - 2020, Issue 11 - November
Google Scholar :
http://bitly.ws/9nMw
Scribd :
https://bit.ly/2IZHN60
Abstract :
Introduction: Studying microscopic traffic
flow characteristics has vital role in reduction of traffic
problems. Gap acceptance and waiting time are traffic
characteristics that are used in capacity, delay and level
of service at unsignalized intersection. A lot of studies
related to gap acceptance and waiting time has been
done in developed countries under homogeneous traffic
and road conditions. Objectives: This study is aimed to
insight gap acceptance and waiting time behavior of
merging or crossing vehicles in urban intersection under
heterogeneous traffic condition and weak lane discipline
in developing country like Ethiopia. Methods: In this
paper three unsignalized intersection in Adama city has
been selected on the basis of traffic volume and
importance of the intersection. The primary data that
were used for this study were traffic volume, speed,
headway, waiting time, geometry of road, gap accepted
and rejected. By using digital Camera, videos data were
recorded; later quantitative data were extracted from
videos. Two Statistical Packages that were used in
analysis of this study. Minitab 19 was used for
developing regression models of waiting time and gap
acceptance for two maneuver types namely traffic
turning to left and turning right from minor road.
Result: Dichotomous generalized linear regression model
(logit model) has been used to predict gap acceptance
probability and validated by Hosmer-Lemeshow testing
techniques to identify the goodness of model. The waiting
time of drivers to accept and reject available gaps for
three selected intersections were about 26sec, 24sec and
20sec. From the developed nonlinear model traffic
turning to left moving with average speed 30kmph,
average headway of 10sec and minor road traffic volume
2000PCu/Hr, increasing 25% major road traffic volume
makes to double waiting time on minor road. Increasing
major road traffic volume by 50% makes to quadruple
waiting time.
Keywords :
Gap Acceptance, Headway Distribution, Logit Model, Maneuver Type, Waiting Time.
Introduction: Studying microscopic traffic
flow characteristics has vital role in reduction of traffic
problems. Gap acceptance and waiting time are traffic
characteristics that are used in capacity, delay and level
of service at unsignalized intersection. A lot of studies
related to gap acceptance and waiting time has been
done in developed countries under homogeneous traffic
and road conditions. Objectives: This study is aimed to
insight gap acceptance and waiting time behavior of
merging or crossing vehicles in urban intersection under
heterogeneous traffic condition and weak lane discipline
in developing country like Ethiopia. Methods: In this
paper three unsignalized intersection in Adama city has
been selected on the basis of traffic volume and
importance of the intersection. The primary data that
were used for this study were traffic volume, speed,
headway, waiting time, geometry of road, gap accepted
and rejected. By using digital Camera, videos data were
recorded; later quantitative data were extracted from
videos. Two Statistical Packages that were used in
analysis of this study. Minitab 19 was used for
developing regression models of waiting time and gap
acceptance for two maneuver types namely traffic
turning to left and turning right from minor road.
Result: Dichotomous generalized linear regression model
(logit model) has been used to predict gap acceptance
probability and validated by Hosmer-Lemeshow testing
techniques to identify the goodness of model. The waiting
time of drivers to accept and reject available gaps for
three selected intersections were about 26sec, 24sec and
20sec. From the developed nonlinear model traffic
turning to left moving with average speed 30kmph,
average headway of 10sec and minor road traffic volume
2000PCu/Hr, increasing 25% major road traffic volume
makes to double waiting time on minor road. Increasing
major road traffic volume by 50% makes to quadruple
waiting time.
Keywords :
Gap Acceptance, Headway Distribution, Logit Model, Maneuver Type, Waiting Time.
