United States Permit Test Coach
Guide and service signsQuestion 85 of 223

A sign has a purple background. Who may use that lane?

  1. Only vehicles with a registered ETC account
  2. Only vehicles that pay cash at the booth
  3. Only vehicles with two or more people
  4. Only vehicles of the road agency
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Correct answer: Only vehicles with a registered ETC account

Purple is used only for vehicles with a registered electronic toll collection (ETC) account. Other drivers must not use that lane.

Source: Manual on Uniform Traffic Control Devices for Streets and Highways (MUTCD), 11th Edition with Revision 1 (FHWA, December 2025), Section 1D.05 Color Code, page 74

Practice guide and service signs

Questions last reviewed: 18 October 2026