The initial costs for collision warning systems (CWS) can be high making it difficult for fleets that experience few crashes to deploy cost-effective solutions.
- CWS installed on fleet vehicles (tractors) used in-cab visual displays and audible alarms to notify drivers to take corrective action if forward radar sensors detected a potential crash.
- ACC maintained set headways between tractors and lead vehicles, and was designed to operate as a conventional cruise control system if no lead vehicle was present.
- AdvBS installed on fleet vehicles used air disc brakes and an electronically controlled braking system to enhance braking performance and reduce stopping distances.
- ACC + AdvBS
- CWS + ACC + AdvBS (bundled system)
A high-level benefit-cost study was conducted to estimate the potential impacts of widespread deployment. The benefit-cost model evaluated four deployment scenarios:
- CWS applied to a national fleet of 1.8 million tractor-trailer units.
- CWS applied to 8 million commercial trucks over 10,000 pounds.
- The bundled system (CWS + ACC + AdvBS) applied to a national fleet of 1.8 million tractor-trailer units.
- The bundled systems applied to 8 million commercial trucks over 10,000 pounds.
The benefit-cost analysis assumed one-time start-up costs in the year 2005, recurring costs through 2024, and one replacement cycle (10 year lifetime). Benefit and cost values were discounted back to 2005 net present values using a four percent discount rate and a seven percent real discount rate to account for the time value of money.
Overall, the analysis indicated that the high initial costs for IVSS would make it difficult for fleets that experience few crashes to deploy cost-effective solutions. There was little or no economic justification for the widespread deployment on all large trucks. With respect to tractor trailers, however, future deployments of CWS were economically justified if relative deployment costs were lower.
Evaluation of the Freightliner Intelligent Vehicle Initiative Field Operational Test Final Report, U.S. DOT, Report No. FHWA-OP-03-179, EDL No. 13871. September 2003.
Published By: U.S. DOT Federal Highway Administration
Source Date: 1/5/2007
EDL Number: 14352
Other Reference Number: FHWA-JPO-07-016URL: http://ntl.bts.gov/lib//jpodocs/repts_te//14352_files/14352.pdf
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intelligent cruise control, ICC, ACC, Intelligent Speed Adaptation, ISA