Tennessee Class D Knowledge Test Practice
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Passing target: 80% (32/40)
You have stopped at a YIELD sign at the end of a short entrance ramp. There is no acceleration lane, and the highway traffic moves fast. When is a gap in the traffic large enough for you to enter?
Blue car A is stopped on a short ramp at a YIELD sign. The ramp ends directly at a two-lane highway, where silver cars B and C travel to the right; no acceleration lane or measured gap is shown.
Correct answer: When the gap is 4 seconds or more and lets you reach traffic speed
Why
Most entrance ramps have an acceleration lane, where you speed up before you merge. Here you start from a stop, so you need more time to reach the speed of traffic. If the gaps are small, stay at the YIELD sign and wait; a driver who pulls out too soon can cause a rear-end or side-impact crash.
Verified against Tennessee Comprehensive Driver License Manual · Traffic Signs — Triangular Shape (Yield); Entering the Interstate; Merging Defensively · p. 50, 82, 108
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