Research Park Boulevard (State Route 255 or SR 255) runs from I-565 to Bob Wade Lane on the north and west sides of Huntsville in Madison County, Alabama.

The road continues southward past Gate 9 into Redstone Arsenal and actually has an additional interchange at the Toftoy Thruway, but this is not considered part of the state route.

This section was named in honor of Martin Luther King Jr. and built to the same road standards as the present at-grade portion of SR 255, allowing for future upgrade to limited access.

The road was built as part of a deal with the Toyota Motor Manufacturing Alabama Plant to allow faster access to I-565.

A plan was created for an overpass at Blake Bottom Road to provide access from the northbound side of SR 255 but, in 2012, the Alabama DOT informed the city of Huntsville that the state will not pay for this project.

[4] Shortly after the 9/11 terror attacks, the project was put on hold indefinitely due to military security concerns.

[6] In late 2020, the city of Huntsville was to begin construction to extend SR 255 to US 231/US 431 North towards Meridianville, which will replace Bob Wade Lane.