Application of Transyt-7f on Signalized Road Junction Networks in Shah Alam and Petaling Jaya

Ismael Albrka, Shaban; Ismail, Amiruddin; A.M Yahia, Hussin; Azizul Ladin, Mohd · 2014 · Crossref

DOI: 10.11113/jt.v69.3108

archive: archived pipeline: cataloged verified

Get this paper ↗ (DOI — opens at the source; we link to it, we don't host it)

Summary

This study addresses the critical issue of traffic congestion in rapidly growing Malaysian cities, specifically Shah Alam and Petaling Jaya. The research is motivated by the significant rise in private vehicle ownership and the resulting inefficiencies in urban road networks, characterized by high average delays, increased fuel consumption, and poor Level of Service (LOS). The primary objective was to evaluate and optimize the performance of signalized road junction networks using TRANSYT-7F software, a traffic simulation and signal timing optimization tool. The study aimed to determine if optimizing signal coordination could mitigate congestion and improve key performance metrics compared to existing uncoordinated signal settings. The methodology involved the analysis of 26 signalized intersections, with 13 selected in each city based on field visits identifying areas prone to congestion. Data collection occurred during evening peak hours (4:30 pm to 5:30 pm) under normal traffic conditions, capturing variables such as cycle time, queue length, traffic flow volume, and phase movements. This data was input into TRANSYT-7F to simulate current network performance and generate optimized signal timing plans. The study compared pre- and post-optimization results across several metrics: Total Travel Times (TTT), Average Delays (AVD), System Wide Travelling Speed (SWTS), Operating Cost (OPC), Fuel Consumption (FUC), Performance Index (PI), and LOS. The results demonstrated substantial improvements in network performance following optimization. In Petaling Jaya, TTT decreased by up to 41%, while in Shah Alam, it decreased by 23%. Average delays were significantly reduced, dropping from 115.2 seconds to 25.2 seconds in Petaling Jaya and from 317.1 seconds to 30.2 seconds in Shah Alam. Consequently, SWTS improved markedly, rising from approximately 27.5 km/hr to 30.2 km/hr in Petaling Jaya. Fuel consumption decreased by 54% in Petaling Jaya and 33% in Shah Alam. Operating costs also fell, with reductions of 67% in Petaling Jaya and 46% in Shah Alam. Furthermore, the Performance Index improved by 33% in Petaling Jaya and 18% in Shah Alam. Most notably, the LOS for intersections shifted from levels D, E, and F (indicating intolerable delays or jammed conditions) to levels B and C (indicating slight to acceptable delays). The study concludes that TRANSYT-7F is an effective tool for enhancing the performance of signalized road networks in congested urban areas. The findings indicate that the primary cause of congestion in these cities was ineffective, uncoordinated signal control rather than insufficient road capacity. By optimizing signal timing and coordination, the software significantly reduced travel times, delays, and operational costs while improving driver comfort and environmental outcomes through lower fuel consumption. The research highlights the importance of data-driven signal optimization over experience-based timing settings for managing urban traffic efficiency.

Provenance

The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed.

Summary generated by qwen3.6-27b-prismaquant on 2026-06-26; verification: verified.

Topics

Ranked by relevance to this paper. Hover a topic for its definition.

• regulatory evaluation