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Additional info for HST: The Second Millennium
The second attribute column represents emission reduction. As described in Chap. 4, for many ITS treatments emission reduction is proportional to motorist delay. The third attribute column is the utility for traveler satisfaction with the treatment. 8 Multivariate utility values for example Alternative ITS project classes (S) 1. Improved incident clearance 2. Restrictive ramp metering 3. Non-restrictive ramp metering 4. Motorist information 5. Motorist service patrol 6. Real time on-board and transit stop information 7.
The previous section discussed likely motorist responses to this information. This section discusses system considerations in providing motorist information. From a transportation system perspective, the objective of diversion is to minimize delay in the corridor and/or maximize mobility (throughput) in the corridor. While diversion, if properly implemented, will reduce delay to the vehicles diverting and reduce delay to the freeway vehicles that do not divert, it will incur additional delay to the vehicles that normally use the diversion route.
Recurrent congestion occurs when demand increases beyond the normally available capacity. It usually is associated with the morning and afternoon work commutes, when demand reaches a level that overwhelms the freeway and traffic flow deteriorates to unstable stop-and-go conditions . 5 and in Chap. 6. • Non-recurrent congestion results from a temporary decrease in capacity while the demand remains unchanged. This kind of congestion usually results when the freeway capacity becomes temporarily restricted.