A national chain from days gone by.  Still a few around, including the Weber's Famous Root Beer in Pennsauken NJ just outside of Philadelphia.  Bright orange... Sparkling clean...  Weber's paints the building and resurfaces and stripes their parking lot every year to keep it that way.  

Smiling, friendly car hops at your window before you can turn off the engine.   A few minutes your tray arrives, complete with frosted mug of Weber's root beer.  Draft root beer.  Root beer floats.  And to be washed down by a mug Weber's famous: Taylor pork roll sandwich with cheese, classic burgers and hot dogs.  When finished, flash your lights for service and yes, the car hop will check to make sure you didn't forget to return the empty mug to the tray.