Showing papers by "Mott MacDonald published in 2004"

The Influence of a Project Performance Measurement System on the Success of a Contract for Maintaining Motorways and Trunk Roads

Abstract: This paper reports the attitudes and experiences of project stakeholders working on a contract in the United Kingdom (UK) for the Highways Agency (HA). The agency used these stakeholders to procure...

Nitrate in groundwater: a water company perspective

Abstract: More than 100 groundwater sources operated by Anglian Water Services are vulnerable to diffuse and point pollution, and 33 of these sources have nitrate concentrations in excess of 50 mg l −1 as NO 3 . Most time series nitrate data ‘recess’ to a long-term rising baseline, upon which seasonal variations and/or data scatter are superimposed. Investigations at boreholes abstracting from the Chalk aquifer show that concentrations decrease with depth below the water table and with time after pump start-up. Abstraction rates do not affect concentrations but the combination of boreholes in use does. A reliable and robust semi-quantitative method for predicting future nitrate concentrations has been developed. Use of this method has allowed a rigorous definition of capital investment requirements under the AMP4 process to maintain compliance with drinking water standards. The method has been used to predict short-term nitrate concentrations for a variety of recharge scenarios.

Using Fuzzy Numbers to Treat Predictions from More Than One Model

Abstract: The treatment of uncertainty is inevitably associated with some subjective judgements. This paper serves to illustrate that there are different approaches, which would deserve investigation. Using results from more than one model has distinct advantages in decision making if used with care.

Origin-destination matrix estimation for the active traffic management project

Abstract: The Highways Agency (HA) is developing the concept of Active Traffic Management (ATM) schemes which will coordinate operational regimes such as controlled use of the hard shoulder as a running lane, variable speed limits and ramp metering. The pilot ATM scheme is planned to be implemented on the eastern section of the M42 between Junctions 3a and 7 by 2006. To ensure the success of all these measures, and to enable the network to be managed safely and effectively, knowledge of the behaviour of the traffic on the network is vital. Origin-destination (OD) demand matrices are at the core of this information, but direct monitoring of trips is at present expensive and unreliable. The principal data sources available to traffic management systems remain inductive loops, which will provide dense coverage on the ATM section with 100m spacing, as compared with 500m spacing on the M25. The new and enhanced methods of dynamic origin-destination matrix estimation (ODME) developed in this project are designed to exploit this and to. support the sophisticated real-time control systems on the section. This paper describes the methods and results of the project conducted in three phases.

A year in the life of a journey time Website

Abstract: This paper presents the results of the evaluation of the Journey Time Planner website. This development website from the Scottish Executive has been co-founded by the Euro Regional project TEMPO (transeuropean intelligent transport systems projects).