Because it's a stairway to heaven, not a ramp.
He never changes his position.
If you repair both, the E-Wheelchair is the only thing running again
Sherlock responds, "A lemon tree my dear Watson."
Him: Um, YOU called ME.
They never stop to ask directions.
Meh
Easy. More traffic is going to hell.
Do they have problems with stairs Or are flying saucers just handicap-accessible