Multi-agent Traffic Light Controls with SUMO Somnuk Phon-Amnuaisuk, Soon-Jiann Tan, Yok-Hoe Yap, Florence Chiao-Mei Choong, Pikul Vejjanugraha, et al. 2023 8th International Conference on Business and Industrial Research Icbir 2023 Proceedings, 2023 This study focuses on the optimization of Traffic Light System (TLS) control through the use of adaptive agents. The performance of adaptive cycle TLS was compared with fixed cycle TLS. Two different adaptive cycle TLS agents were investigated, reactive and Deep Q-Network (DQN) agents. The reactive agent adjusted its control signals based on traffic measures such as queue length, while the DQN agent employed a deep reinforcement learning algorithm to determine its control signals. Two sets of simulations were conducted to evaluate the performance of both approaches. The results showed that the adaptive cycle TLS was more effective in reducing waiting times and increasing traffic throughput than the fixed cycle TLS. Among the adaptive agents, the reactive agent outperformed the DQN agent, due to the difficulty in learning an optimal policy in the traffic control domain, which has a non-stationary and complex nature. This preliminary study showed the potential benefits of using adaptive agents for traffic light control, and further studies in various areas such as employing more advanced TLS control methods, expanding the scale of the study, and applying real-demand in the simulation, could be carried out in future work.
Spatial analysis of road traffic accident hotspots: evaluation and validation of recent approaches using road safety audit El-Said Mamdouh Mahmoud Zahran, Soon Jiann Tan, Eng Hie Angel Tan, Nurul Amirah 'Atiqah Binti Mohamad 'Asri Putra, Yok Hoe Yap, et al. Journal of Transportation Safety and Security, 2021 Reducing road traffic accidents (RTA) and their socioeconomic costs is an increasingly important priority in many countries. In recent years, many authors have proposed various approaches t...
Development of a road illumination measurement system Muhammad Amirul Afiq bin Ramli, Mohammad Rakib Uddin, Soon Jiann Tan, El-Said Mamdouh Mahmoud Zahran, Yok Hoe Yap 4th International Conference on Intelligent Transportation Engineering Icite 2019, 2019 Several measures, such as reduced lighting, may be adopted to minimise energy consumption while providing an optimal and safe level of road lighting. One approach to evaluate the safety impact of reduced road lighting is by using Geographical Information System (GIS) to identify road sections with low level of illumination and high risk of road traffic accidents. The GIS approach required a cost-effective and efficient system to measure the level of lighting provision at close intervals along a road network. This paper presents the development and validation of a road illumination measurement system developed for this purpose. The system is based on TSL2561 illumination sensors, u-blox NEO-6M GPS module, Robotdyn Arduino Mega Pro Embed and Catalex microSD shield. The results showed that the measurements obtained from the developed system followed a similar trend as a commercial light meter, and that it could be used to identify road sections with relatively low levels of illumination for further safety analysis using GIS.
An investigation into the impact of alternate road lighting on road traffic accident hotspots using spatial analysis El-Said Mamdouh Mahmoud Zahran, Soon Jiann Tan, Yok Hoe Yap, Eng Hie Tan, Christian Marc Francisco Pena, et al. 4th International Conference on Intelligent Transportation Engineering Icite 2019, 2019 The aim of this paper is to investigate the impact of alternate road lighting (i.e. switching off every other road light at selected roadways) on road traffic accident (RTA) hotspots using Spatial Traffic Accident Analysis (STAA) – a GIS hotspot analysis method that takes into account RTA frequency and socio-economic impact. STAA was used to identify and rank into four hierarchical risk levels day-time and night-time RTA hotspots before and after the implementation of alternate road lighting along a study road. Using the day-time RTA hotspots as a comparison group and night-time RTA hotspots as treatment group, the changes to the length of RTA hotspots of the four hierarchical risk levels were evaluated. There was an overall increase in the lengths of RTA hotspots with moderate and serious risk levels, while there was an overall reduction in the lengths of RTA hotspots with minor and significant RTA risk levels. Some of the limitations of the current study were identified and further research is recommended to validate the current findings.
Application of reflective papers in civil engineering education: A case study Global Journal of Engineering Education, 2019
GIS-based forest fire risk assessment for the Belait District Iet Conference Publications, 2018
A review of transport demand modelling for the school run in Brunei Darussalam Iet Conference Publications, 2018
Statistical correlation between road surface roughness and traffic accidents Iet Conference Publications, 2018
Causes of shortage and delay in material supply: A preliminary study M M Rahman, Y H Yap, N R Ramli, M A Dullah, M S W Shamsuddin Iop Conference Series Materials Science and Engineering, 2017 Shortage and delay in materials supply is argued to be one of the most important factors that lead to delay in construction project delivery globally. However, the relevant underlying reasons vary from country to country. As such, this paper summarises the outcomes of a study that targeted identifying causes of shortage and delay in materials supply in Brunei Darussalam. The study was conducted through fifteen semi-structured interviews of contractors and materials suppliers in Brunei. The study identified six causes of shortageof materials and nine causes of delay in materials supply in Brunei. The most importantcausefor shortage of materials relates to the origin or availability of construction materials. On the other hand, the most influential cause of delay in material supply was found to be poor materials procurement and inventory management system, which has other underlying reasons such as late identification of the type of materials needed. The observations are expected to help in formulating or reviewing relevant policies, in order to ensure on-time project delivery.
A Novel Approach for Identification and Ranking of Road Traffic Accident Hotspots El-Said M.M. Zahran, Soon Jiann Tan, Yok Hoe Yap, Ena K.A. Rahman, Nurulhikmah H. Husaini Matec Web of Conferences, 2017 Road Traffic Accidents (RTA) are known to be one of the main causes of fatalities worldwide. One usef ul approach to improve road safety is through the identification of RT A hotspots along a road, so they can be prioritised and treated. This paper introduces an approach based on Geographical Information System (GI S) to identify and prioritise RTA hotspots along a road network using historical RTA data. One particular urban road in Brunei with a historically high rate of RT As, Jalan Gadong, was selected as a case study. Five years of historical RTA data were acquired from the relevant authorities and input into a GIS database. GI S analysis was then used to identify the spatial extension of the RT A hotspots. The RT A hotspots were ranked according to three different schemes: frequency, severity and socio-economic impact of RTAs. A composite ranking scheme was also developed to combine these schemes; this enabled the prioritisation and development of intervention and maintenance programmes of the identified RTA hotspots. A visualisation method of the RTA spatial distribution within each identified RTA hotspot was also developed to determine the most risky road stretches within each hotspot, which is important for treatment prioritisation when limited resources are available.
Traffic Safety Analysis of Roundabouts: A Literature Review NF Naim, YH Yap, SJ Tan Advances in Civil, Chemical, and Petrochemical Engineering for Sustainable … , 2026 2026
Traffic Safety Analysis of Roundabouts: A Literature Review NF Naim, YHY Yap, SJ Tan 9th Brunei International Conference on Engineering and Technology 2023 , 2023 2023
Multi-agent Traffic Light Controls with SUMO S Phon-Amnuaisuk, SJ Tan, YH Yap, FCM Choong, P Vejjanugraha, ... 8th International Conference on Business and Industrial Research , 2023 2023 Citations: 2
Spatial analysis of road traffic accident hotspots: evaluation and validation of recent approaches using road safety audit ESMM Zahran, SJ Tan, EHA Tan, NAAB Mohamad'Asri Putra, YH Yap, ... Journal of Transportation Safety & Security 13 (6), 575-604 , 2021 2021 Citations: 59
Development of a Road Illumination Measurement System MAA bin Ramli, MR Uddin, SJ Tan, ESMM Zahran, YH Yap 2019 4th International Conference on Intelligent Transportation Engineering … , 2019 2019 Citations: 1
An Investigation into the Impact of Alternate Road Lighting on Road Traffic Accident Hotspots Using Spatial Analysis. ESMM Zahran, SJ Tan, YH Yap, EH Tan, CMF Pena, HF Yee, MR Uddin ICITE, 242-246 , 2019 2019 Citations: 9
Application of reflective papers in civil engineering education: a case study EK Abdul Rahman, SK Abdul Rahman, AA Md. Nor, SJ Tan, YH Yap, ... Global Journal of Engineering Education 21 (2), 145-149 , 2019 2019 Citations: 6
Evaluation of various GIS-based methods for the analysis of road traffic accident hotspot MM ZahranEl-Said, SJ Tan, NAAB Mohamad’Asri, EHA Tan, YH Yap, ... MATEC Web of Conferences 258 , 2019 2019 Citations: 14
GIS-based forest fire risk assessment for the belait district SNM Said, S Shams, EMM Zahran, YH Yap 7th Brunei International Conference on Engineering and Technology 2018 … , 2018 2018 Citations: 3
Statistical correlation between road surface roughness and traffic accidents N Hikmah, SJ Tan, E Zahran, YH Yap, H Taib 7th Brunei International Conference on Engineering and Technology 2018 … , 2018 2018 Citations: 6
A review of transport demand modelling for the school run in Brunei Darussalam F Ariffin, YH Yap, E Zahran, SJ Tan IET Digital Library , 2018 2018
Causes of shortage and delay in material supply: a preliminary study MM Rahman, YH Yap, NR Ramli, MA Dullah, MSW Shamsuddin IOP Conference Series: Materials Science and Engineering 271 (1), 012037 , 2017 2017 Citations: 76
A Novel Approach for Identification and Ranking of Road Traffic Accident Hotspots ESMM Zahran, SJ Tan, YH Yap, EKA Rahman, NH Husaini MATEC Web of Conferences 124, 04003 , 2017 2017 Citations: 28
A GIS-based approach to identification and prioritisation of road traffic accident hotspots ESMM Zahran, SJ Tan, YH Yap, EK Abdul Rahman, N Abdullah Brunei International Conference on Engineering and Technology (BICET) 2016 , 2016 2016 Citations: 3
The effect of reflective paper on students’ performance in civil engineering education EK Abdul Rahman, SK Abdul Rahman, AA Md. Nor, SJ Tan, YH Yap, ... Brunei International Conference on Engineering and Technology (BICET) 2016 , 2016 2016
A review of road traffic accident statistics and trends in Brunei Darussalam SJ Tan, S Ladi, ESMM Zahran, YH Yap, EK Abdul Rahman, N Abdullah Brunei International Conference on Engineering and Technology (BICET) 2016 , 2016 2016 Citations: 3
An innovative approach to road safety auditing based on geometric and operational considerations YH Yap, ESMM Zahran, EK Abdul Rahman, SJ Tan Brunei International Conference on Engineering and Technology (BICET) 2016 , 2016 2016
The Impact of Exiting Flows on Roundabout Lane Entry Capacity YH Yap 47th Annual Conference of the Universities’ Transport Study Group , 2015 2015
Modelling Roundabout Capacities YH Yap University of Southampton , 2015 2015 Citations: 1
Models of Roundabout Lane Capacity YH Yap, HM Gibson, BJ Waterson Journal of Transportation Engineering 141 (7), 1-9 , 2015 2015 Citations: 24
MOST CITED SCHOLAR PUBLICATIONS
Causes of shortage and delay in material supply: a preliminary study MM Rahman, YH Yap, NR Ramli, MA Dullah, MSW Shamsuddin IOP Conference Series: Materials Science and Engineering 271 (1), 012037 , 2017 2017 Citations: 76
An international review of roundabout capacity modelling YH Yap, HM Gibson, BJ Waterson Transport Reviews 33 (5), 593-616 , 2013 2013 Citations: 71
Spatial analysis of road traffic accident hotspots: evaluation and validation of recent approaches using road safety audit ESMM Zahran, SJ Tan, EHA Tan, NAAB Mohamad'Asri Putra, YH Yap, ... Journal of Transportation Safety & Security 13 (6), 575-604 , 2021 2021 Citations: 59
A Novel Approach for Identification and Ranking of Road Traffic Accident Hotspots ESMM Zahran, SJ Tan, YH Yap, EKA Rahman, NH Husaini MATEC Web of Conferences 124, 04003 , 2017 2017 Citations: 28
Models of Roundabout Lane Capacity YH Yap, HM Gibson, BJ Waterson Journal of Transportation Engineering 141 (7), 1-9 , 2015 2015 Citations: 24
Evaluation of various GIS-based methods for the analysis of road traffic accident hotspot MM ZahranEl-Said, SJ Tan, NAAB Mohamad’Asri, EHA Tan, YH Yap, ... MATEC Web of Conferences 258 , 2019 2019 Citations: 14
Hook Turns as a Solution to the Right-Turning Traffic Problem NB Hounsell, YH Yap Transportation Science 49 (1), 1-12 , 2015 2015 Citations: 11
An Investigation into the Impact of Alternate Road Lighting on Road Traffic Accident Hotspots Using Spatial Analysis. ESMM Zahran, SJ Tan, YH Yap, EH Tan, CMF Pena, HF Yee, MR Uddin ICITE, 242-246 , 2019 2019 Citations: 9
Application of reflective papers in civil engineering education: a case study EK Abdul Rahman, SK Abdul Rahman, AA Md. Nor, SJ Tan, YH Yap, ... Global Journal of Engineering Education 21 (2), 145-149 , 2019 2019 Citations: 6
Statistical correlation between road surface roughness and traffic accidents N Hikmah, SJ Tan, E Zahran, YH Yap, H Taib 7th Brunei International Conference on Engineering and Technology 2018 … , 2018 2018 Citations: 6
GIS-based forest fire risk assessment for the belait district SNM Said, S Shams, EMM Zahran, YH Yap 7th Brunei International Conference on Engineering and Technology 2018 … , 2018 2018 Citations: 3
A GIS-based approach to identification and prioritisation of road traffic accident hotspots ESMM Zahran, SJ Tan, YH Yap, EK Abdul Rahman, N Abdullah Brunei International Conference on Engineering and Technology (BICET) 2016 , 2016 2016 Citations: 3
A review of road traffic accident statistics and trends in Brunei Darussalam SJ Tan, S Ladi, ESMM Zahran, YH Yap, EK Abdul Rahman, N Abdullah Brunei International Conference on Engineering and Technology (BICET) 2016 , 2016 2016 Citations: 3
Multi-agent Traffic Light Controls with SUMO S Phon-Amnuaisuk, SJ Tan, YH Yap, FCM Choong, P Vejjanugraha, ... 8th International Conference on Business and Industrial Research , 2023 2023 Citations: 2
Development of a Road Illumination Measurement System MAA bin Ramli, MR Uddin, SJ Tan, ESMM Zahran, YH Yap 2019 4th International Conference on Intelligent Transportation Engineering … , 2019 2019 Citations: 1
Modelling Roundabout Capacities YH Yap University of Southampton , 2015 2015 Citations: 1
Traffic Safety Analysis of Roundabouts: A Literature Review NF Naim, YH Yap, SJ Tan Advances in Civil, Chemical, and Petrochemical Engineering for Sustainable … , 2026 2026
Traffic Safety Analysis of Roundabouts: A Literature Review NF Naim, YHY Yap, SJ Tan 9th Brunei International Conference on Engineering and Technology 2023 , 2023 2023
A review of transport demand modelling for the school run in Brunei Darussalam F Ariffin, YH Yap, E Zahran, SJ Tan IET Digital Library , 2018 2018
The effect of reflective paper on students’ performance in civil engineering education EK Abdul Rahman, SK Abdul Rahman, AA Md. Nor, SJ Tan, YH Yap, ... Brunei International Conference on Engineering and Technology (BICET) 2016 , 2016 2016
