Use a Model S --map marker, facing the car's direction

Feel free to tuck on `&rgb=RRGGBB` and `&opacity=0.0…1.0` to the url, and an optional `zoom=N` level if there's nicer ideas than black at opacity 0.8 and the default zoom of 5.

See http://jsfiddle.net/ecmanaut/fvEqr/ for source, if you want to tweak around more or fork the fiddle first.