This is an extremely bad idea.

If you need to accellerate away from a threatening situation such as someone about to hit you, you're at a horrible disadvantage.

Also, it is illegal in some states to do this.

also:

Myth No. 5: It's best to shift an automatic transmission into Neutral at red lights. This myth stems from the idea that keeping the transmission in Drive while stepping on the brake wastes fuel and causes unnecessary wear on the driveline. In fact, actual engine wear and fuel loss are minimal.

Regularly shifting from Neutral and back into Drive when the light turns green, then immediately stepping on the gas, can wear — albeit slightly — on the transmission, driveline and engine mounts. Ultimately, these stoplight antics probably won't amount to any measurable harm or good; they're likely just a habit by folks who need to keep their hand busy with the gear selector. Our advice? Get a stick shift.

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