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General Knowledge · Managing Space

Why should a driver avoid traveling alongside another vehicle for an extended distance in a wide commercial vehicle whenever it can be avoided?

1.Because it removes the space needed to react if the other driver changes lanes suddenly, and can trap the vehicle needing to change lanesCorrect answer
2.Because most state traffic codes specifically prohibit two commercial vehicles from ever occupying adjacent travel lanes on the very same roadway
3.Because a wide vehicle's side mirrors cannot legally be adjusted far enough to actually view the whole of an adjacent lane
4.Because fuel economy drops by a measurable amount whenever two large vehicles travel side by side for an extended distance

Explanation

A driver should avoid lingering beside another vehicle because doing so removes the space cushion needed to react if that driver changes lanes unexpectedly, and it can leave the commercial vehicle trapped with nowhere to go if it needs to change lanes. Understanding how to manage space to the sides of the vehicle is part of the required knowledge CDL applicants must have under 49 CFR 383.111(a)(10)(iii), but that paragraph only names "space to the sides" as a required knowledge topic; it does not itself state this side-clearance reasoning, which is standard driver-training content rather than a codified federal rule. The other options fail for a shared reason: each invents a rule or effect that does not exist, whether a legal prohibition on adjacent lane travel, a mirror-adjustment restriction, or a fuel-economy claim.

Source: 49 CFR 383.111(a)(10)(iii)

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