by a sign or where right turns are controlled by dedicated traffic lights. (The last state with a right-on-red ban, Massachusetts, ended its ban on January 1, 1980, but about 90% of the traffic signals in the state were outfitted with "no turn on red" signs in preparation for the change.) The few exceptions include New York City, where right turns on red are prohibited unless a sign indicates otherwise, and in Washington, DC, which will prohibit right turns on red in 2025. In some states, such as New York, Virginia, North Carolina, Nebraska, Nevada, and California, a right turn on red is prohibited when a red arrow is displayed. At intersections where U-turns are permitted and controlled by a U-turn arrow from the left-most lane, motorists turning right on red onto the same road must yield to those making U-turns before turning, as the motorists making U-turns have the right of way and a collision could easily occur. The exception is Pennsylvania where U-turns are allowed unless otherwise specified following the same rule as right on red, drivers making a U-turn are required to yield to all drivers executing legal maneuvers including turning right on red. At intersections where U-turns are prohibited in the same fashion, a green right turn arrow will sometimes appear for those turning right onto the road, allowing only traffic turning right to proceed without having to stop or yield to other vehicles or pedestrians. Some states such as California have "No U-Turn" signs posted at these intersections because of the green right turn arrow. Most Caribbean countries with right-hand traffic, such as the Dominican Republic, allow right turn on red unless a sign prohibits it. Some vehicles, such as those carrying hazardous materials and school buses, are not allowed to turn on red under any circumstance and must wait for a green light or arrow. As of 1992, right turn on red is governed federally by (c) ("Each proposed State energy conservation plan to be eligible for Federal assistance under this part shall include: ...(5) a traffic law or regulation which, to the maximum extent practicable consistent with safety, permits the operator of a motor vehicle to turn such vehicle right at a red stop light after stopping, and to turn such vehicle left from a one-way street onto a one-way street at a red light after stopping."). All turns on red are forbidden