Install a vehicle alarm or mechanical lock for the steering wheel or ignition.
Always lock the doors and leave the windows rolled up.
Always activate any auto alarms or anti-theft devices.
Keep valuables out of sight. Expensive items in full view invite theft even if the vehicle is locked.
Place valuable items in your trunk not the front or back seats.
Know the license number, year, make and model of your vehicle.
Do not leave money, checkbooks, or credit cards in the vehicle at any time.
Preventing Bicycle Theft:
Keep bicycles locked any time they are unattended with a good "U" type lock or a good casehardened padlock and cable. Make sure the "U" lock or cable goes through the front wheel, rear wheel and the frame and secure it to a fixed object.
Check the lock by pulling on it to make sure it is secure.
Use an engraver to place an identifying mark on unpainted major bicycle components.
Retain all evidence of purchase, including the serial number.
Be able to identify the bicycle by it color and it's features.
Have one or more close up color photographs of the bicycle on hand.
Never loan your bicycle or other property to strangers.
Avoid parking a bicycle in a deserted or poorly lit area.