Bus acceleration and braking

Topics related to collision & Trajectory analysis formerly on our 'Registrants only' area however which we get asked about frequently so believe shoud be in the open forum too
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MSI
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Posts: 1140
Joined: Thu Jun 18, 2009 12:37 pm

Bus acceleration and braking

Post by MSI » Fri May 08, 2015 11:24 am

A few references on Bus acceleration and braking
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.
Acceleration and Braking Performance of 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.
Acceleration and Braking Performance of Transit Style Buses
  • 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).
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MSI
Site Admin
Posts: 1140
Joined: Thu Jun 18, 2009 12:37 pm

Re: Bus acceleration and braking

Post by MSI » Wed Sep 23, 2015 10:51 pm

Be sure to also see the topic: for links to research by NHTSA on bus safety.
Question? Comment? Please email forum@mchenrysoftware.com. Also see the McHenry Forum Index
Visit McHenrySoftware.com for technical information & software.
(c) McHenry Software, Inc ALL Rights Reserved.

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