The route is memorialized as the Selma To Montgomery Voting Rights Trail

The Selma to Montgomery marches were a series three marches that marked the  
peak of the American civil rights movement. They grew out of the voting rights
movement in Selma, Alabama. The third march of 25,000 people concluded at
the steps of the State Capitol Building where Martin Luther King, Jr. delivered
his “How Long, Not Long” speech (below).