There is no need to invent the wheel again..A ready to go car sharing system is the electric Smart project from Daimler/Mercedes, called car2go which is successful all over the world. In Amsterdam 300 electric Smarts are driving around 24/7. Free parking everywhere, and just E 0,29 a minute.
Judge orders Jerusalem Gay Pride attacker to undergo psychiatric evaluation (Haaretz)
from the article: Tel Aviv looks to offer electric cars for short-term rental