It's A Motion Sensor For Crissakes!

Susan takes the expressway when she drives home from work. Every day she encounters a line of cars backed up at the entrance ramp. They're all waiting for the traffic light thing to turn green. Susan is sure you've seen one, it has a red light which remains illuminated, and a green light. As each car rolls up to the traffic light thing it will turn from red to green allowing the car to proceed and Susan to inch a little closer to home. However, if the car does not roll far enough to trip the motion sensor the driver will just sit there staring at the red light while the top of Susan's head explodes.

Susan gets all twitchy just anticipating the entrance ramp, she doesn't need to wait until she gets there. She finds it difficult to believe that people don't understand that the traffic light thing employs a motion sensor.
Even after they sit there for forty or fifty minutes.
Her only hope is that their foot falls asleep and slips off the brake so they roll forward unintentionally.

Why is it even necessary to interfere with people merging onto the expressway? Merging is easy, just drive fast.
People need help backing up. Susan has a terrific and smart girlfriend who won't back up at all. Ever.
Help Susan's friend and stop screwing with Susan's drive home!