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233946

A Comparison of Daytime and Nighttime Operating Speed on Rural Multi- Lane Highway Sections in Egypt

Article

Last updated: 23 Jan 2023

OverviewSimilar Items

Subjects

-

Tags

Civil Engineering

Abstract

Traditionally, the 85th  percentile of observed speeds is used to represent the operating speed associated with a specific site with certain geometric features. The presence of sunlight enhances the vision of drivers during daytime while visibility usually degrades during nighttime, especially on rural roads where no street lighting exists, and drivers would depend solely on their vehicle headlights. Visibility degradation is a safety concern which is magnified on horizontal curves. The objective of this study, therefore, is to compare operating speed in daytime and nighttime conditions on both tangent sections and horizontal curves. The analysis made use of spot speed data collected on horizontal curves of two major rural multilane highway in Egypt. Spot speed data were collected using speed guns during daytime and nighttime. The spot speed data were used to calculate the mean speed, variance of speed, and the 85th percentile speed. Analysis of Variance (ANOVA) was used to compare the speeds in daytime and nighttime. For most cases, it was shown that no significant difference existed in speed for daytime and nighttime. This was mainly attributed to the generous design features of the highway elements (e.g., large radii of horizontal curves, wide lanes, etc.). An attempt was made to develop operating speed models to see which variables impact speed during daytime. The results of operating speed models' development were deemed inappropriate due to the lack of variability in speeds.

DOI

10.21608/sej.2022.135873.1012

Keywords

Operating speed, multilane rural roads, radar gun, horizontal alignment, Statistical Analysis

Authors

First Name

Talaat

Last Name

Abdel-wahed

MiddleName

-

Affiliation

Highway and Traffic Engineering , Civil Engineering , Sohag University

Email

dr.talaat_ali@eng.sohag.edu.eg

City

Sohag

Orcid

0000-0001-5383-7275

First Name

Mohamed

Last Name

El Esawey

MiddleName

-

Affiliation

Highway and Traffic Engineering , Civil Engineering , Ain Shams University

Email

m.elesawey@eng.asu.edu.eg

City

Cairo

Orcid

0000-0002-5881-2090

Volume

2

Article Issue

2

Related Issue

36594

Issue Date

2022-09-01

Receive Date

2022-04-25

Publish Date

2022-09-01

Page Start

66

Page End

78

Print ISSN

2735-5888

Online ISSN

2735-5896

Article File

SEJ_Volume 2_Issue 2_Pages 66-78.pdf

PDF . 553.3kB

Link

https://sej.journals.ekb.eg/article_233946.html

Detail API

https://sej.journals.ekb.eg/service?article_code=233946

Order

1

Type

Original research articles

Type Code

1,763

Publication Type

Journal

Publication Title

Sohag Engineering Journal

Publication Link

https://sej.journals.ekb.eg/

MainTitle

-

Details

Type

Article

Created At

23 Jan 2023