When is it illegal to make a U-turn?

• A. On a curve or where there is a sign prohibiting it
• B. On straight roads during the day
• C. In residential driveways
• D. In a parking lot

Answer: (A)

Making a U-turn is restricted where you can't safely see approaching traffic or where signs tell you not to turn. A curve reduces visibility, so you may not be able to judge gaps in traffic in time, increasing the risk of a head-on collision. Signs that prohibit U-turns convey a clear legal restriction in that location, so following them is mandatory.

So the situation described—doing a U-turn on a curve or where a sign forbids it—is illegal because visibility is compromised or a prohibition is posted. On straight roads during the day isn’t by itself illegal, and U-turns in residential driveways or parking lots aren’t automatically illegal either; those scenarios depend on local rules and signs, but they aren’t the universal restraint identified by the rule about curves and prohibiting signs.