They're getting rare (as they're torn down and rebuilt), but if you stop at a rest stop along the interstate and encounter a men's or women's restroom that has

They're getting rare (as they're torn down and rebuilt), but if you stop at a rest stop along the interstate and encounter a men's or women's restroom that has two entrances, that's one that was built during segregation, and it originally had a wall inside dividing it into white and colored sections.