California Driver License (DMV) Written Test 2026 – 400 Free Practice Questions to Pass the Exam

Traffic control signals are devices used to regulate traffic and ensure safety on the road. They communicate specific instructions, such as when to go, slow down, or stop, to drivers and other road users. This is essential to keep traffic flowing smoothly and to prevent accidents. The other options are incorrect because they do not directly relate to the purpose of traffic signals. They may serve a secondary function or may occasionally provide information, but their primary purpose is to regulate traffic.