Under what circumstance is it legal to exceed the posted speed limit?

Exceeding the posted speed limit is typically considered illegal; however, there are specific circumstances where it can be permissible. When passing another vehicle, it may be necessary to accelerate beyond the speed limit to safely complete the maneuver, especially if the vehicle being passed is moving slowly or if conditions dictate that a quick lane change is essential for safety. In such situations, drivers are expected to exercise caution and ensure that they can safely return to their original lane without endangering themselves or other road users.

In contrast, the other options generally do not allow for legal speeding. In construction zones, speed limits are usually reduced for safety reasons, and it’s crucial to adhere to posted signs. A traffic light turning green simply indicates that it is legal to proceed, but it does not justify exceeding the speed limit. Similarly, on a one-way street, while there may not be opposing traffic, the speed limit still applies and must be followed.