State-by-state laws re: usage of snow chains:
http://www.witruck.org/state_chain_laws.pdf
Snow chains go on drive wheels only.
Maximum speed for a vehicle with tire chains is greatly reduced. If you will be driving on highways – even local ones – unless you can do a max of about 30 mph safely, you shouldn’t have them on your tires.
An improperly fastened chain, or one that breaks, can damage your car and be unsafe.
If the streets are clear and your only concern is getting into and out of parking spots, I don’t recommend chains. On clear roads, they will actually reduce your traction. They should only be used if the roads themselves are snowy/slippery. If the roads are bad, you probably should avoid diving anyway, if possible.
The heavier your vehicle, the more chains will help. A garbage truck or city bus will have their traction improved far more than a lightweight car will.
Speak to your mechanic instead of relying on anonymous posters for safe driving info. Yes, I include myself in “anonymous posters”.