All Outputs (12)

Observations of traffic behaviour from UK motorway roadworks sections with narrow lanes (2016)
Presentation / Conference
Nassrullah, Z., Yousif, S., & Norgate, S. (2016, January). Observations of traffic behaviour from UK motorway roadworks sections with narrow lanes. Presented at UTSG, Bristol, UK

In recent years, implementation of narrow lanes is frequently used as a temporary traffic management scheme (TTMS) on UK motorway roadwork sections. The rationale is to free up carriageway space, especially for sites with high traffic demands needing... Read More about Observations of traffic behaviour from UK motorway roadworks sections with narrow lanes.

Modeling factors influencing the capacity of motorway merge sections controlled by ramp metering (2011)
Presentation / Conference
sections controlled by ramp metering. Presented at 6th International Symposium on Highway Capacity and Quality of Service, Stockholm, Sweden

This paper focuses on studying factors which are likely to affect motorway merge capacity when ramp metering controls are in use. A newly developed traffic micro-simulation model has been used for this purpose and the well known ALINEA and Demand-Cap... Read More about Modeling factors influencing the capacity of motorway merge sections controlled by ramp metering.

Estimation of critical occupancy values for UK motorways from traffic loop detectors (2010)
Presentation / Conference
Al-Obaedi, J., & Yousif, S. (2010, June). Estimation of critical occupancy values for UK motorways from traffic loop detectors. Presented at Salford Postgraduate Annual Research Conference, The University of Salford, Salford, United Kingdom

Occupancy is the percent of time a traffic loop detector embedded in the road pavement is occupied by vehicles. This term is usually used as a substitution for the traffic density which is not feasible to obtain from detectors. One of the recent a... Read More about Estimation of critical occupancy values for UK motorways from traffic loop detectors.

Modelling ramp metering at motorway merges (2010)
Presentation / Conference
Al-Obaedi, J., & Yousif, S. (2010, May). Modelling ramp metering at motorway merges. Poster presented at Celebration of Research, Faculty of Science, Engineering & environment, University of Salford, Salford, Greater Manchester

Traffic congestion has increased rapidly in the past decades mainly due to a sharp increase in vehicles using the road networks. Recently, and to deal with motorway congestion, traffic signal devices (ramp metering) installed on motorway entrances w... Read More about Modelling ramp metering at motorway merges.

Partial elliptical two-regime speed-flow traffic model based on the highway capacity manual (2010)
Presentation / Conference
Yousif, S. (2010, January). Partial elliptical two-regime speed-flow traffic model based on the highway capacity manual. Presented at 9th International Postgraduate Research Conference in the Built and Human Environment, Salford, Greater Manchester

There have been several attempts to describe traffic flow behaviour by modelling the relationship between the main variables describing traffic such as speed, flow and density. Some of these models are based on simplistic assumptions and therefore,... Read More about Partial elliptical two-regime speed-flow traffic model based on the highway capacity manual.

Testing visual angle car following models using different sets of data (2010)
Presentation / Conference
Al-Obaedi, J., & Yousif, S. (2010, January). Testing visual angle car following models using different sets of data. Presented at Universities Transport Studies Group - 42nd Conference, University of Plymouth

The basic assumption in visual angle car following models is that the following distance between successive vehicles is a function of the object (i.e. leading vehicle) width. This paper examines the validity of this assumption using two types of dat... Read More about Testing visual angle car following models using different sets of data.

Examining the limitations for visual angle-car following models (2009)
Presentation / Conference
Al-Obaedi, J., & Yousif, S. (2009, January). Examining the limitations for visual angle-car following models. Presented at Universities Transport Studies Group 41st Conference, University College London

Visual angle car following models assume fixed values (thresholds) for the angular velocity (∆Ө/∆t) over which the driver of the following vehicle is affected by the leading vehicle. This paper explains the advantages and limitations of such models... Read More about Examining the limitations for visual angle-car following models.

Validation of a mathematical model to estimate turning movements as roundabouts using field data (2007)
Presentation / Conference
Yousif, S., & Razouki, S. (2007, January). Validation of a mathematical model to estimate turning movements as roundabouts using field data. Presented at Universities Transport Studies Group - 39th Annual Conference, University of Leeds

In this paper, a mathematical model was presented and used to determine turning movements at roundabouts based on field data. Assumptions were made in order to simplify the model; such as no U_turns from and to the same arm of a roundabout, total tr... Read More about Validation of a mathematical model to estimate turning movements as roundabouts using field data.

Comparison of accepted gaps for different on-street parking designs (2000)
Presentation / Conference
Purnawan, & Yousif, S. (2000, October). Comparison of accepted gaps for different on-street parking designs. Presented at 5th ISSM, Paris, France

Potential problems could arise when drivers leave their parking stalls and merge into the main traffic stream. These problems could partly be attributed to finding acceptable gaps to merge into with safety and without causing undue difficulties to f... Read More about Comparison of accepted gaps for different on-street parking designs.

On-street parking manoeuvres and their effects on design (1999)
Presentation / Conference
Purnawan, & Yousif, S. (1999, March). On-street parking manoeuvres and their effects on design. Presented at 4th ISSM, Kassel, Germany

Vehicle manoeuvres when entering or leaving on-street parking can be a contributory factor to causing congestion. Little explicit attention has been given to these manoeuvres and their indirect potential effects on the moving traffic. In the design... Read More about On-street parking manoeuvres and their effects on design.

A study into urban roadworks with shuttle-lane operation (1998)
Presentation / Conference
Samoail, N., & Yousif, S. (1998, April). A study into urban roadworks with shuttle-lane operation. Presented at Proceedings of the 3rd Institute of Mathematics and its Applications International Conference on Mathematics in Transport Planning and Control, Cardiff, UK

In urban areas where roadworks are required, single lane shuttle operation is applied, especially where there is limited road space. There are operational problems relating to the site such as site geometry, visibility, length of roadworks zone, pos... Read More about A study into urban roadworks with shuttle-lane operation.

The use of visual angle in car following traffic micro-simulation models
Presentation / Conference
Al-Obaedi, J., & Yousif, S. The use of visual angle in car following traffic micro-simulation models. Presented at International Built & Human Environment Research Week (IRW)., Salford, Greater Manchester

This paper presents a detailed literature review on car following models and methods used in describing the behaviour between two drivers of successive vehicles travelling in a traffic stream. The paper then concentrates on presenting a proposed car... Read More about The use of visual angle in car following traffic micro-simulation models.