SCHOOL BUS ACCELERATION CHARACTERISTICS
- Gattis, J L,Nelson, S,Tubbs, J D
MBTC FR 1054-2,FHWA/AR-98-009,Final Report
Research was conducted to collect speed, time, and distance data for Type C and D ("full size") school buses accelerating from a stopped position. Most of the tests were conducted on level terrain. By combining the knowledge of how quickly a school bus can accelerate with assumed speeds of oncoming through-street vehicles, the needed intersection sight distance can be calculated. Another application of the findings is analyzing departure sight distance at railroad grade crossings used by school buses.
- Journal Article
SAE paper 2012-01-0593
Charles Funk, Timothy Howery, Joseph Jager, Daniel Lee
There is a limited amount of data currently available on the acceleration and braking performances of school buses. This paper analyzes the braking performance of various Type A and Type C school buses with hydraulic and air brakes. The effect of ABS and Non-ABS systems as well as driver experience is discussed. A comparison with passenger car braking performance is presented. The acceleration of a school bus is also presented. Evaluations of “normal” and “rapid” accelerations are presented for Type A and Type B buses. A comparison with commonly used acceleration values for various vehicles is presented.
- Technical Paper
SAE Paper 2012-01-0618
James D. English, Roman F. Beck
Determining pre-impact acceleration and braking performance values is an important aspect of reconstructing collisions. Collision analysts may have to rely upon performance testing of an exemplar vehicle for reliable data to use in traffic collision reconstruction cases. These performance characteristics are well documented for many vehicle classes, but are limited when discussing urban transit style buses. The constant stop and go urban driving conditions in which they operate constantly challenge the vehicle components. Because of the heavy weights and operating conditions, auxiliary braking systems are often installed to prolong the life of the service brakes. A series of idle acceleration, maximum acceleration, and maximum braking tests were conducted using urban transit style buses that are currently in-service in a large metropolitan area. The initial braking target speed for these braking tests was 64 kph (40 mph).