This paper presents results from a project on The Evaluation of Delays to Freight on the Trunk Road Network. This research was commissioned by the Highways Agency as part of its 'Understanding Travel Behaviour' programme, managed by TRL Ltd. The work has been undertaken by staff from the Institute for Transport Studies, The University of Leeds (Dr A S Fowkes, Dr P E Firmin, Mr K A Fox, and Mr L Putranto), The Transport and Logistics Research Unit, The University of Huddersfield (Dr A E Whiteing and Mr L Swallow) and Mr G Tweddle. This paper considers three types of delay. The first of these was due to increased free-flow journey times. The second was due to increased spread of actual arrival times, and the third was schedule delay in undertaking the journey. The research has utilised the Leeds Adaptive Stated Preference (LASP) survey methodology (Fowkes and Tweddle, 1988) which is described in Section 2. Following this, Section 3 describes the sampling procedures and the resulting characteristics of the sample obtained. Results are then presented and discussed in Section 4, followed by a discussion of the range of factors thought to underlie the importance of the need for travel time reliability, as deduced from discussions with survey respondents. The paper ends with concluding remarks.
Samenvatting