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CDL · Space Management

What is a 'No-Zone' around a tractor-trailer?

Reviewed by Jordan Morley, Editorial Lead at 247SimpleTests. Written by the 247SimpleTests Editorial Team from the official source material cited on every question.

Correct answer

An area of large blind spots where other vehicles disappear from the driver's view

  1. A A federally designated no-parking zone
  2. B A zone where the trailer cannot turn
  3. C An area of large blind spots where other vehicles disappear from the driver's view
  4. D An area where the truck is prohibited from changing lanes

Why this is the answer

The 'No-Zones' are the large blind spots around a tractor-trailer where smaller vehicles disappear from the driver's view. They are located: directly in front of the tractor (about 20 feet), directly behind the trailer (about 200 feet), along the entire right side of the trailer (the biggest blind spot), and along part of the left side near the driver's door. Most crashes between trucks and cars happen because a car is in a No-Zone when the truck driver changes lanes or turns. CDL drivers should know exactly where these blind spots are on their vehicle and check each one before any lane change. Educating car drivers about No-Zones is also part of FMCSA public outreach because cars that linger alongside trucks put themselves at risk.
Source: FMCSA CDL Manual 2.6.5 The 'No-Zones'

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About this topic: Space Management

Heavy vehicles need much more space than passenger cars, and other drivers consistently underestimate this. Following distance, stopping distance, and gap judgment are core CDL skills. This is one of 6 General Knowledge questions on space management, each with a full explanation on a single study page.

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