My taxi sitcom was punted round the networks, but they're all saying they're inundated with taxi sitcoms at the moment, and are filing them in the "no thanks" tray alongside "flat sharing 20 somethings with glamourous lives sitcoms" and "university grad" sitcoms.
They're probably all written by cabbies taking bloomin' creative writing classes, thinking they can write.
I couldn't even get mine on radio, so it's best to write something else for the foreseeable.