Colorado CDL Practice Test 2026 - Free Commercial Driver’s License Practice Questions and Study Guide

The correct answer indicates that it is prohibited for a driver to make a phone call while operating a Commercial Motor Vehicle (CMV). Federal regulations stipulate that using a handheld mobile phone while driving a CMV is illegal. This rule is in place to ensure safety on the road by minimizing distractions that can lead to accidents.

The prohibition applies specifically to those using the phone without hands-free technology. While hands-free operation might be deemed safer, the rules focus on eliminating distractions that could compromise the driver's attention. Therefore, the complete ban on using handheld devices helps to promote safer driving practices among commercial vehicle operators, as their responsibility includes the safety of themselves, their cargo, and other road users.

Other options imply various scenarios where phone use might be acceptable, but these do not align with the stringent regulations that prioritize safety by disallowing manual interaction with mobile devices while driving a CMV.