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Title Document type Published
Reducing Congestion from Highways Works

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Information on the work TRL (Transport Research Laboratory) is conducting on reducing congestion from highways works on behalf of the UK's Department for Transport and Transport for London.

General Information 03/07/12 Add icon
TRL 585 Capacity implications of Advanced Stop Lines for cyclists

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An investigation of the capacity implications of installing Advanced Stop Lines (ASLs) has been carried out by TRL Limited as part of a project entitled Cycling Facilities and Engineering, commissioned by the Charging and Local Transport Division of the Department for Transport. The study included a review of previous research into ASLs in the UK and in the Netherlands; an examination of the theoretical capacity implications of installing ASLs using OSCADY (Optimised Signal Capacity and Delay) the signal-controlled junction modelling computer programme and saturation flow formulae; 'before' and 'after' video surveys of modified junctions at four sites in Guildford, Surrey, and questionnaires to examine the attitudes of cyclists. While cyclists generally thought that the ASLs were safer and easier to use than unadapted junctions, concerns were expressed that some drivers did not comply with the new layout. Changes in the length of time between green signals or a longer minimum green time may be required in some circumstances. At the two sites where the number of traffic lanes remained the same there was a slight increase in saturation flow, but at the two sites where a traffic lane was removed large reductions in saturation flow were observed. This report of the study concludes with several recommendations.

Research 01/01/03 Add icon
TRL 358 Further developments in the design of contra-flow cycling schemes

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This research investigates the safety implications and practical methods of allowing contra-flow cycling in one-way streets in the UK. Five 'alternative' contra-flow cycle schemes (ie schemes not including a mandatory cycle lane or physical segregation) were examined. Video filming and interviews with cyclists were used to collect data from the sites. The results were supplemented by data supplied by the local authority responsible for the schemes; this data included vehicle speeds and reported accidents. The schemes appeared to operate safely, supporting the wider use of alternative contra-flow cycle schemes in the UK. Design advice is proposed on how this can be best achieved. Important factors to consider when designing contra-flow schemes are motor vehicle flows, motor vehicle speeds, delivery vehicles, parking and side roads.

Research 01/01/98 Add icon
TRL 276 Cycle parking supply and demand

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The Transport Research Laboratory was commissioned by the Department of the Environment, Transport and the Regions to study cycle parking in relation to land use, locations and journey purposes. This research reviews current literature on cycle parking and examines the cycle parking policies of 26 UK local authorities. The cycle parking behaviour of cyclists in Leicester, Nottingham and Southampton is also studied. Using an innovative video technique, cycle parking duration, location and formality has been assessed and analysed in relation to land use and journey purpose. On-street interviews with cyclists parking cycles has provided attitudinal data together with information on distance from the locked cycle to the main destination, experience of theft and willingness to use cycle lockers. The research has revealed that convenience and security are of primary importance to cyclists when parking their cycles. (A)

Research 01/01/97 Add icon
TRL 189 Bike and ride: its value and potential

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This research has examined the attitudes and behaviour of over 1200 cyclists, car drivers, car passengers and taxi passengers making use of joint transport facilities at 5 rail stations and 3 bus Park and Ride sites in England. It has focused on the value of such transport interchanges to cyclists, and the potential that exists for a modal switch from private motorised transport to the bike. These themes are addressed in terms of the composition of this cycling population, their reasons for cycling, the provision of cycle parking and the attitudes of private motorised transport users to cycling. It has revealed that the economic and health benefits of cycling, as well as its convenience, have made it attractive to the cyclist even when alternative transport modes are available. It has also shown the scope and potential for encouraging more private motorised transport users to transfer to the bike.

Research 01/01/96 Add icon
TRL 621 The effect of road narrowings on cyclists

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As part of the UG171 Cycle Facilities and Engineering project for the Department for Transport, TRL investigated cycling near road narrowings in a study comprising: (l) Consultations with cyclist to ascertain their views on road narrowing features and their experience of negotiating them in traffic. (2)Video surveys of sites where features were installed by highway authorities to assist cyclists in negotiating road narrowings. (3)Virtual reality simulations of encounters between drivers and cyclists, allowing the reactions of drivers to be measured under a range of circumstances. Road narrowings were found to constitute a source of stress to cyclists, particularly when large vehicles were present, although fast traffic and large roundabouts were also thought difficult. Some cyclists avoided narrowings by riding on the footway or selecting alternative routes. There were experimental indications that a cycle lane with coloured surface might improve safety and the report discusses this and other recommendations that could improve conditions for cyclists in the context of the results of the study.

Research 01/01/05 Add icon
TRL 462 Cycle track crossings of minor roads

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Cycle tracks can help cyclists to avoid sharing busy roads with motor vehicles. One of the main problems with providing them, however, is the design of crossings of minor roads. This introduces a hazard and cyclists are usually required to give way. Highway authorities have been reluctant to give priority to cyclists in case drivers fail to observe the priorities and casualties occur. This project investigates the safety and effectiveness of a variety of cycle track crossing arrangements at minor road T-junctions, including crossings with priority for cyclists. Five cycle track crossings were monitored using video cameras and 223 cyclists using the crossings were interviewed. The report draws conclusions about the safety of various designs and makes recommendations about cycle track crossing design.

Research 01/01/00 Add icon
TRL 648 Development of Compact MOVA

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MOVA (Microprocessor Optimised Vehicle Actuation) is a traffic signal control strategy designed for isolated (uncoordinated) junctions. It currently accounts for about 15% of UK isolated signal controlled junctions. MOVA has proven to be significantly better than standard Vehicle Actuation (VA) traffic signal control in terms of junction capacity and vehicular delay. Compact MOVA allows MOVA to be installed without the use of the more distant ‘IN-detectors’ on all or selected low speed approaches (where the 85th percentile speed is less than 35 mph). Hence Compact MOVA costs less to install and maintain, and it can be used in situations where the siting of the IN-detector would have proved difficult. The results of microscopic simulation and on-street trials indicate that Compact MOVA can be expected to provide an average of about a 7% vehicle delay reduction at junctions compared with standard vehicle actuation (which is about half of what MOVA normally achieves). During congested periods Compact MOVA behaves similarly to MOVA. At Puffin crossings significant reductions in pedestrian delay were shown, with little effect upon vehicle delay. Compact MOVA has been incorporated into MOVA M5 and distributed to the traffic signal companies supplying MOVA. Draft advice on the use of Compact MOVA has been included in this report. Some further experience of Compact MOVA is required before its inclusion in the MOVA Application Guides.

Research 07/11/05 Add icon
TRL 631 The Safety of MOVA at High Speed Junctions

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MOVA is a traffic signal control system, originally designed for junctions that are not part of a linked UTC system. It has proven to be significantly better than standard Vehicle Actuated (VA) system in terms of capacity and delays. Currently there are estimated to be about 1,000 MOVA sites in the UK with installation rates of at least 100 per year. During the development of MOVA, there were no specific requirements to improve safety compared with existing control strategies. However, early studies at high speed sites proved that MOVA can reduce red-running substantially and accident data from the early high speed sites suggested they could well be safer. In the study reported here, 25 high speed sites currently equipped with MOVA and previously equipped with VA and Speed Assessment/discrimination equipment were studied. The accident period was 15 years, with at least three years prior and three years post MOVA implementation at each site. The result was that, overall, MOVA was no safer than the previous control strategy. After considering the quality of MOVA data, it was shown that the better configured sites had a lower accident frequency under MOVA than under VA and the reverse was true for the poorly configured sites.

Research 01/01/05 Add icon
TRL 518 Linkage of hospital trauma data and road accident data

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The British national road accident reporting system (STATS19) has three categories to record injury severity - killed, serious and slight. The value to researchers of enhancing STATS19 casualty records with clinical information has long been recognised. A new source of clinical data has been made available to TRL by the UK Trauma Audit and Research Network. These data have been combined with STATS19 data for England from 1994-96. The additional information includes details about the journey to hospital, length of stay in hospital and the injuries sustained by body region. This report describes the process used to link the two data sets. It provides an overview of the new data, and reports several detailed statistical analyses. These include a regional comparison of the time taken for casualties to reach hospital and an investigation of the consequences of a longer journey for a casualty's prospects of survival.

Research 01/01/01 Add icon
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