The Specification of the Planning Systems; Report of the 1993 Questionnaire Survey

This report describes a survey carried out as part of a research project undeaaken hy the Institute for Transport Studies and the School of Computer Studies at the University of Leeds, funded by the Science and Engineering Research Council. The project was concerned with the specification of trip planning systems, which are systems which provide information to travellers and potential travellers ahout all aspects of their journey, but in this case principally route and timetable information for public transport users and route information for car travellers before the journey is made. Previous evidence had suggested that travellers may make sub-optimal travel decisions, meaning that they may make longer, slower or more expensive journeys than necessary because of imperfect information. Other parts of the project addressed sub-optimality in the choice of mode and time of travel but a main objective of the survey described in this report was to examine sub-optimality of route choice separately for journeys with which respondents were familiar and journeys with which they were unfamiliar. Other objectives were concerned with the travel information currently used, or desired by, the respondents, who were randomly-selected travellers from the West Yorkshire town of Mirfield. Maps were widely used by car drivers - about one in five used them for familiar trips and ahout three quarters used them for unfamiliar trips. For public transport trips, timetables were used hy about half of the travellers making familiar trips and 95 per cent making unfamiliar trips. Information on delays would have been welcomed by both private and puhlic transport travellers: nearly three-quarters of familiar and unfamiliar car trips would have liked congestion information as would a significant minority of bus users. Most of all, public transport-users would have welcomed information on service delays and cancellations. It would seem that real-time information on delays would be a key feature of a successful trip planning system. The sub-optimality for car journeys averaged at 2.6 minutes per trip for familiar trips and 6 minutes per trip for unfamiliar trips. Sub-optimality was directly related to trip distance for familiar trips hut not for unfamiliar trips. This indicates a modest hut significant reduction in car journey times could be brought about by trip planning systems. Public transport trip sample sizes were too small to permit reliable estimates to be made of their sub-optimality

Strategic Compensation: Does Business Strategy Influence Compensation in High-Technology Firms?

This study examined whether a firm\u27s business strategy influences the firm\u27s compensation systems in high-technology firms. For the firm strategy variable, we used innovation strategy, which is one of the most critical business strategies in the high-technology industry. Our analysis showed that a firm\u27s emphasis on innovation is positively related to the firm\u27s employee pay level, both short-term pay and long-term pay. Moreover, a firm\u27s emphasis on innovation has significant influence on several other aspects of employee compensation management. Innovation is positively associated with the difference in pay level between R&D employees and other employees, time orientation of employee compensation (the relative emphasis on long-term pay to short-term pay), and the length of the stock option vesting period. The influence of innovation is significant after controlling for industry membership

Determinants of Preference for Contingent Employment

This paper explores the determinants of preference for contingent employment using a national probability sample of temporary workers and independent contractors. A multi-level model of preference and multivariate analyses indicate that the opportunity cost of contract work, number of job opportunities, prior experience, human and financial capital, access to health benefits, prior experience, and work-family factors predict preference for contingent employment. These results are moderated by gender and by type of contingent work arrangement. Temporary workers differ from independent contractors and men differ from women with respect to which factors are associated with preference. The implications for organization human resource policy and social policy are discussed

Travel Time Variability of a Group of Car Commuters in North London

This working paper describes a study of the variability of journey times of a panel of fifteen commuters using one north London radial corridor, over a total of seven weeks in the spring and summer of 1987. The objectives were to gain preliminary information on the extent of journey time variability and on the commuters* perception of and responses to the variability they experienced. The procedure for selecting the panel and contacting them is described, together with the data collection method, which consisted principally of panellists using tape recorders in their cars to record the time at which fixed points along the route were passed on each day's journey to work. Early or late arrival and its consequences in relation to the day's tasks were recorded at the destination. Analyses are presented of the distributions of times of complete and partial journeys, of the relationship between journey duration and variability and of the effects of diversion in response to perceived traffic conditions. The safety margins needed to ensure given percentages of punctual arrivals were estimated and contrasted with those from previous studies. Further analyses are presented indicating the general unimportance of punctuality for these panellists, the effects of significant lateness when it did occur, and of the panellists' ability to predict their arrival times in advance. A study of highway link travel time variability and its causes was also carried out for cars at the a same time in the same corridor. The methodology, surveys and data processing of this parallel study are set out in ITS Working - Paper 278, and the results and analysis in ITS Working Paper 279

Car Travel Time Variability on Links of a Radial Route in London: Methodology, Surveys and Data Processing

This working paper is one of a series of three describing research on travel time variability of car drivers using a north London corridor. The objectives of the work described in this report were to determine the amount of variability experienced within short time periods and between time periods, and to explain these variations in terms of simultaneously-recorded traffic factors. This report describes the methodology used, the surveys carried out and the data processing procedures. Data were collected on twelve contiguous links on the A41 between 0730 and 1030 on weekdays in spring and again in summer. Link travel-time distributions for cars were obtained by registration-plate matching using hand-held electronic data loggers. The methods of treatment of spurious matches and outliers, resulting respectively from chance matching of partial registration numbers and from stopping or diverting vehicles, are described. The reasons for selecting particular explanatory traffic variables are presented, together with a description of the methods of data collection. The results of these surveys and their analysis are contained in ITS Working Paper 279. The methodology, data collection procedure and analysis of journey time variability experienced by a panel of car commuters using the same corridor are contained in ITS Working Paper 277

Car Travel Time Variability on Links of a Radial Route in London: Results

This working paper describes the results of a study of the variability of travel times and its causes on links of a secti.on of the A41 radial route in north London in the spring and summer of 1987. The objectives were to estimate the extent of variability of travel times of private car users and to explain the observed variability by means of models incorporating a range of traffic factors, including traffic flow, and incorporating seasonal differences. In general the spring was slower and showed more travel time variation between time periods than the summer. slower and more variable links in the spring tended to behave similarly in the summer. The models produced explained around two thirds of the travel time variation between periods, but the explanatory power and explanatory variables differed between links. Blocking of the downstream exit from links was the single variable which was significant in affecting traffic times on most links

Project FATIMA Final Report: Part 2

The final report of project FATIMA is presented in two parts. Part 1 contains a summary of the FATIMA method and sets out the key recommendations in terms of policies and optimisation methodology from both project OPTIMA and project FATIMA. Part 1 is thus directed particularly towards policy makers. Part 2 contains the details of the methodology, including the formulation of the objective functions, the optimisation process, the resulting optimal strategies under the various objective function regimes and a summary of the feasibility and acceptability of the optimal strategies based on consultations with the city authorities. This part is thus mainly aimed at the professional in transport planning and modelling