Iowa CDL Pre-Trip Inspection: Lights Test 2026

Your lights and signals are how you communicate with everyone around you, and this Iowa CDL pre-trip lights and signals test covers the checks that confirm they all work before you drive. Making sure every lamp functions is a required piece of the 2026 pre-trip inspection exam.

Expect questions on checking the headlights on low and high beam, confirming the turn signals and four-way flashers work front and rear, verifying the brake lights and tail lights, inspecting the clearance and marker lights along the trailer, and making sure every lens is clean and the right color. Knowing which lights are required and how to spot a burned-out bulb is exactly what these lights and signals questions reward.

Because Iowa determines the number of pre-trip inspection items, check the Iowa CDL Manual for the current count. Run this lights and signals drill until confirming every lamp is second nature, then continue through the rest of your pre-trip inspection prep.

Keep going:

• Iowa CDL Pre-Trip Inspection Practice Test
• Iowa CDL Pre-Trip Inspection Practice Test 2
• Iowa CDL Pre-Trip Inspection Test
• Iowa CDL Practice Test
• Iowa Air Brakes Practice Test
• Iowa CDL Combination Practice Test
• Iowa Hazmat Practice Test
• Iowa Class A CDL Practice Test
• Iowa CDL Practice Test

Every question traces back to the Iowa CDL Manual - skim the right-of-way and signs chapters before your retake.