Iowa Permit Test 3 Question An empty truck: Answers Requires a shorter stopping distance than a full truck. Requires a longer stopping distance than a full truck. Takes the same distance to stop as a full truck. Explanation Empty trucks require longer stopping distances than full trucks because they have less traction available. Answer Statistics 26.51 % of our users get this question wrong. This questions is relatively Easy. Iowa Permit Test This questions appears in the following tests: California Knowledge Test Class B ,