After MD 776 (Sunset Boulevard), the old alignment of MD 312, splits to the north, MD 312 and MD 480 enter the town of Ridgely and the highway's name changes to Sixth Street.
Following MD 776 (Sunset Boulevard), the original route of MD 312 splits northward, leading MD 312 and MD 480 into Ridgely, where the highway is now called Sixth Street.