Changing transportation costs as perceived by users can influence, in the short run, route choice, time of travel, trip frequency, and linking of trips. Over the long term, these changes could influence urban form through residential and business location decisions, auto ownership, and the technology of transportation. Increasing attention has been given to the use of road-pricing strategies as a means of reducing congestion (such as a feedback mechanism to system users). Although such strategies are often difficult Implement from a political perspective, they will likely become part of the strategy "mix" that planners will be investigating in the future. 9. Transportation service providers have increasingly used more sophisticated management systems and advanced technologies to provide surveillance and control of transportation networks. These types of systems and technologies will increasingly be considered essential to effective transportation system management. Thus, they will be part of the strategies likely to be considered during the planning process.