10 Manage and Adjust Vehicle Space Relations

Performance Skill Standard:

Conditions of Performance:

  • Given a typical tractor-trailer, a road, a route of travel, and traffic…

Statement of Work to be performed:

  • … The driver will properly manage the space required for safe vehicle operation.

Performance Criteria:

  • Select a lane offering the best mobility and least traffic interruption, in accordance with the law, to cause minimum interference to other vehicles.
  • Assure a safe gap before changing lanes, passing other vehicles, merging, relative to crosswalks so as to minimize hazards to other road users.
  • Position tractor-trailer appropriately before initiating and completing a turn so as to prevent other vehicles from passing on the wrong side and to minimize encroachment on other lanes.
  • Maintain a following distance appropriate to traffic, road surface, visibility, and vehicle weight; maximize separation from traffic when vehicle is disabled.
  • Avoid structures having inadequate overhead clearance.

Performance Elements and Assessment Criteria:

  • Explain basic formula for determining safe following distance.
  • Judge adequacy of gaps in traffic for passing, crossing traffic, entering traffic, and changing lanes.
  • Use proper visual search techniques to determine and achieve appropriate space.
  • Properly position vehicle for making all driving moves, and avoiding getting other drivers or pedestrians in the wrong spot.
  • Judge clearance on all sides of truck in motion, especially above the trailer.
  • Adjust following distances for loads and road conditions.

Braking Time

                Distance Traveled per sec – 1.466 foot per MPH

Reaction / Perception Time .75 sec.

                Brake Lag .5 sec

                Deceleration Time depends on speed

                Distance = Speed2/(30*f) where f is co-efficient of friction

Following Distance

                7 Second Rule

                Judging by Stationary Object