Well, compressed air. Looks very promising, but it won't be out for a year or so. The prototype is noisy and slow but the designers promise much better performance from the production models.
Looks interesting, but from a safety standpoint it appears to be a death trap.
A pigeon landing on the hood would destroy the contraption instantly, not to mention a dear or, God forbid, getting hit by a real car or truck
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"The main vice of capitalism is the uneven distribution of prosperity. The main vice of socialism is the even distribution of misery." --Winston Churchill
I always laugh at the stations that have pay air machines. No way. Even garages that have a pay machine out front will point out the free air line if you ask, if they like having business.