This is designed for (push)bikes, but it seems like it might have some potential for use by urban scooterists as well.
It is a laser device that 'paints' an illuminated lane around the bike (scooter). It offers a visual reminder to cars and trucks as to what space you 'own'.
Interesting concept.
http://www.amazon.com/X-Fire-5-LED-Taillight-Laser-Marker/dp/B0084U2RKY/ref=sr_1_1?s=sporting-goods&ie=UTF8&qid=1387879123&sr=1-1
Not sure if it would have legal ramifications or not, but I'm throwing it out there: