Proceedings of the 3rd International Conference on Science in Engineering and Technology (ICOSIET 2024)

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Are Direct Left-Turns a Smart Solution for a Sustainable Traffic Future?

Authors
Ratnasari Ramlan1, *, Jurair Patunrangi1, Muh Kasan1, Dini A. Talibu2, Oatman Likenono3
1Department of Civil Engineering, Engineering Faculty, Tadulako University, Palu, Indonesia
2Civil Engineering Undergraduate Program, Department of Civil Engineering, Faculty of Engineering, Tadulako University, Palu, Indonesia
3Engineering Technology of Road and Bridge Construction Program, Department of Civil Engineering, Faculty of Engineering, Tadulako University, Palu, Indonesia
*Corresponding author. Email: ramlanratnasari@gmail.com
Corresponding Author
Ratnasari Ramlan
Available Online 7 July 2025.
DOI
10.2991/978-94-6463-768-7_27How to use a DOI?
Keywords
Direct Left-Turn; Intersection Performance; Sustainable Traffic; Saturation Degree; Signalized Intersection
Abstract

This study aims to evaluate whether the implementation of a direct left turn (DLT) can serve as an effective solution for sustainable transportation, using a case study at the signalized intersection of Moh. Yamin-Sisingamangaraja in Palu City. The research includes field observations at the Moh. Yamin-Sisingamangaraja intersection and a literature review on direct left turns to evaluate their effectiveness for sustainable traffic management. The findings revealed that the application of DLT at this intersection did not result in significant improvements, showing a saturation degree of 1.3 and disruptions in the left-turn lane that slowed traffic. A review of related studies suggests that while DLT or right turn on red could improve traffic efficiency, its implementation must be tailored to the specific conditions of each intersection. The study concludes that although DLT has the potential to enhance to sustainable traffic efficiency, its implementation requires thorough contextual assessment to ensure effectiveness.

Copyright
© 2025 The Author(s)
Open Access
Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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Volume Title
Proceedings of the 3rd International Conference on Science in Engineering and Technology (ICOSIET 2024)
Series
Advances in Engineering Research
Publication Date
7 July 2025
ISBN
978-94-6463-768-7
ISSN
2352-5401
DOI
10.2991/978-94-6463-768-7_27How to use a DOI?
Copyright
© 2025 The Author(s)
Open Access
Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

Cite this article

risenwbib
TY  - CONF
AU  - Ratnasari Ramlan
AU  - Jurair Patunrangi
AU  - Muh Kasan
AU  - Dini A. Talibu
AU  - Oatman Likenono
PY  - 2025
DA  - 2025/07/07
TI  - Are Direct Left-Turns a Smart Solution for a Sustainable Traffic Future?
BT  - Proceedings of the 3rd International Conference on Science in Engineering and Technology (ICOSIET 2024)
PB  - Atlantis Press
SP  - 243
EP  - 250
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-768-7_27
DO  - 10.2991/978-94-6463-768-7_27
ID  - Ramlan2025
ER  -