Although the time and distance required to stop a vehicle depends on several variables, a four second interval typically provides a safe following distance for heavy-duty commercial vehicles on dry roads. The four seconds are broken down into: one second to identify the hazard and react; two seconds to slow down, stop or change direction; and one second for distractions, such as checking mirrors. The pay-off is: reduced chance of rear-ending another vehicle; reduced need for panic stops; and, consequently, reduced risk of being rear-ended when braking. This article explains how to establish a safe following distance by using the four-second rule.

Media Info

  • Pagination: p. 60-61
  • Serial:

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Filing Info

  • Accession Number: 00490713
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 31 1990 12:00AM