M25 controlled motorway - results of the first two years

Harbord, B

doi:10.1049/cp:19980173

Cited by 7 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The HTMS also caused a decrease in travel times in one direction while travel times in the other direction were increased. This is caused not only by imposed speed limits but also by more strict enforcement [11]. Also, further investigations on this highway could not demonstrate a statistically significant decrease in travel times [12].…”

Section: State-of-artmentioning

confidence: 99%

Evaluation of a Mobile Highway Management System at Roadwork Zones

2022

IJE

View full text Add to dashboard Cite

Road construction and maintenance activities cause traffic congestions and delays and present challenges for ensuring the safety of both motorists and road workers. While urban areas are well-equipped with traffic devices, in the case of highways our chances to collect traffic data and control traffic flows may be limited. Then the use of a temporary Highway Traffic Management System seems to be a suitable solution. Although the impacts of its deployment are addressed by many theoretical studies and demonstrated on traffic simulation models, there are not many references dealing with field tests. We provide results of the practical evaluation of the temporary Highway Management System installed and tested on the main highway in the Czech Republic during the road works period. Before-after analysis of collected traffic data was performed to prove the importance and positive impact of the proposed solution. We demonstrate an over 20% increase in the capacity of the roadwork zone and an almost 30 seconds decrease in average delay for one vehicle Highway administrators can use the results to justify investments into the temporary deployment of mobile traffic management systems.

show abstract

Section: State-of-artmentioning

confidence: 99%

Evaluation of a Mobile Highway Management System at Roadwork Zones

2022

IJE

View full text Add to dashboard Cite

show abstract

“…VSL control can also be used to reduce the chance of secondary accidents by displaying lower speed limits when there has been an accident on the freeway [9,12,[14][15][16][17][18]. Due to these bene ts, use of VSL controls have been encouraged in various countries such as the Netherlands, Sweden, England, Japan, and Turkey [19][20][21][22]. VSLs can also help drivers to adapt their speed to match traf c, environmental, or weather conditions [23].…”

Section: Introductionmentioning

confidence: 99%

Smart Dynamic Traffic Monitoring and Enforcement System

El-Hansali¹,

Outay²,

Yasar³

et al. 2021

Computers, Materials &Amp; Continua

View full text Add to dashboard Cite

Enforcement of traf c rules and regulations involves a wide range of complex tasks, many of which demand the use of modern technologies. variable speed limits (VSL) control is to change the current speed limit according to the current traf c situation based on the observed traf c conditions. The aim of this study is to provide a simulation-based methodological framework to evaluate (VSL) as an effective Intelligent Transportation System (ITS) enforcement system. The focus of the study is on measuring the effectiveness of the dynamic traf c control strategy on traf c performance and safety considering various performance indicators such as total travel time, average delay, and average number of stops. United Arab Emirates (UAE) was selected as a case study to evaluate the effectiveness of this strategy. A micro simulation software package VISSIM with add-on module VisVAP is used to evaluate the impacts of VSL. It has been observed that VSL control strategy reduced the average delay time per vehicle to around 7%, travel time by 3.2%, and number of stops by 48.5%. Dynamic traf c control strategies also alleviated congestion by increasing the capacity of the bottleneck section and improving safety. Results of this study would act as a guidance for engineers and decision makers to new traf c control system implementation.

show abstract

“…Reactive approaches monitor inactive bottlenecks and activate after a certain threshold (Hong et al., ; Brinckerhoff et al., ). For instance, a VSL system on the M25 highway in the United Kingdom activates when traffic volume exceeds 1,650 veh/h/lane and reduces speed limit from 70 to 60 mph (Harbord, ). In fact, reactive approaches activate the VSL strategy after detecting a problem.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Speed Harmonization in Connected Urban Street Networks

Tajalli

Hajbabaie

2018

Computer aided Civil Eng

View full text Add to dashboard Cite

Connected vehicle technology, the Internet of Things, and other advanced communication technologies create possibilities to facilitate the movement of vehicles through transportation networks and reduce their travel time. Harmonizing the speed of vehicles in different network links not only yields a more efficient network capacity utilization, but also regulates the movement of vehicles to achieve a “smoother” flow of traffic. This study develops a mathematical nonlinear formulation for dynamic speed harmonization in urban street networks aiming at improving traffic operations. We have converted the nonlinear problem into a linear program utilizing the fundamental flow–density relationship and developed a model predictive control approach to account for stochastic changes in traffic demand and further improve the efficiency of the developed solution algorithm. Results showed that the algorithm efficiently found dynamic optimal advisory speeds on various network links, and speed harmonization significantly reduced the travel time (up to 5.4%), speed variance (19.8%–29.4%), and the number of stops (8.3%–18.5%), while increasing the average speed (up to 5.9%) and the number of completed trips (up to 4%) in our case study network under all tested demand patterns.

show abstract

M25 controlled motorway - results of the first two years

Cited by 7 publications

References 0 publications

Evaluation of a Mobile Highway Management System at Roadwork Zones

Evaluation of a Mobile Highway Management System at Roadwork Zones

Smart Dynamic Traffic Monitoring and Enforcement System

Dynamic Speed Harmonization in Connected Urban Street Networks

Contact Info

Product

Resources

About