| Title | Analysis of Position Error Headway Protection |
|---|---|
| Record ID | 49492 |
| Personal Name Creator |
Whitten, Robert E. |
| Source | 104p. in various pagings |
| Corporate Creator | John A. Volpe National Transportation Systems Center (U.S.) |
| Corporate Contributor |
United States. Urban Mass Transportation Administration |
| Publisher | United States. Urban Mass Transportation Administration |
| Publication Date | 19750701 |
| Language | English |
| Abstract | An analysis is developed to determine safe headway on PRT systems that use point-follower control. Periodic measurements of the position error relative to a nominal trajectory provide warning against the hazards of overspeed and unexpected stop. A computer program has been developed to model these hazards for arbitrary safety system design parameters. The results of computer runs indicate that the critical hazard on the main guideway is unexpected stop of a preceding car; on a station entry deceleration ramp, it is overspeed of a following car. The deceleration ramp headways are larger and are more sensitive to system parameters than are the main guideway headways. Typical headways are five seconds on a 30 mph main guideway and 16 seconds on a deceleration ramp for state-of-the-art system parameters. With advanced system parameters and emergency decelerations applicable to well supported, seated passengers, required headways are 2.5 seconds on the main guideway and 3.5 seconds on the deceleration ramp. |
| Rosap ID | dot:10934 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/10934 |
| TRT Terms | Automatic control; Braking performance; Computer programming; Deceleration; Hazards; Headways; Personal rapid transit; Research; Safety; Safety engineering; Simulation; Traffic signal control systems; Urban transportation |
| Classification | NTL - PUBLIC TRANSPORTATION - Advanced Public Transit Systems; NTL - PUBLIC TRANSPORTATION - PUBLIC TRANSPORTATION; NTL - PUBLIC TRANSPORTATION - Transit Planning and Policy; NTL - PUBLIC TRANSPORTATION - Transit Safety and Security |
| Geographical Coverage |
United States |
| Contract Number | DOT-TSC-421 |
| Report Number | DOT-TSC-UMTA-75-10; UMTA-MA-06-0031-75-3 |
| Resource type | Tech Report |
| URL | https://ntlrepository.blob.core.windows.net/lib/49000/49400/49492/DOT-TSC-UMTA-75-10.pdf |
| Format | |
| Database | NTL Digital Repository |