What is the smartest and most effective way to save money for a vechicle?

I've been wanting to save up for a car but i find it difficult to not use the money that is saved. What are better methods?|||Invest the money in some short term CDs (3 month, 6 months, 1 yr, etc...). That way you won't be able to touch the money. Any bank should be able to set you up with them. Rate will be low but it sure beats spending the money.