Year - 2012
As traffic congestion grows in cities and suburban areas throughout the United States, the cost of traveling is directly affected and increased. A new concept for combating congestion is the idea of Value Pricing, also known as congestion pricing. The Value Pricing theory involves altering the pricing of transportation facilities, so that it can lead to improved service for transportation users, leading to a more productive use of existing transportation capacities.
It has been observed from recent studies that vehicular impacts to highway bridges are the 3rd leading cause of collapse of highway bridges. Recent data from the Federal Highway Administration (FHWA) and other studies show that the bridge overload and lateral impact from trucks, ships and train constitute 20% of the total bridge failures. The National Highway Traffic Safety Administration (NHTSA) estimates that annually 1000 buses or trucks (10,000 pounds gross weight or greater) collide with bridge structures.
The location of Variable Message Signs (VMS) has not been adequately addressed by the research community yet it is a standard practice among state and local transportation agencies. The past few years have witnessed a new trend - mainly in Asian countries (e.g. Beijing, Shanghai, Singapore) – in the use of VMSs to provide traffic flow information in full/partial LED displays.
The Highway Capacity Manual (HCM) has had a delay-based level of service methodology for signalized intersections since 1985. The upcoming edition of the HCM (2010) will revise that method. This is happening concurrent with such jurisdictions as NYC reviewing the use of the HCM method in their environmental impact regulations (e.g. CEQR process), and concurrent with a dialog in the profession on when it is appropriate to use simulation models in lieu of HCM methods.