Having CCTV can prove very useful at times and even just the presence of a camera can be enough to put people off trying to enter your property or your vehicles.
If you have a CCTV system then you may only watch it if you suspect someone had been on your property, but you may miss some important footage. Often with CCTV systems you can set them up to alert you to movement. This can usually be set to only alert you at certain times of the day such as at night when there is no reason for anyone else to be on your property. Usually the alerat will come through as an email or a text message and it may even include the video footage of the movement. You can usually change the sensitivity so if you find you are getting alerts every time the tree blows in the wind then you may want to turn it down.
IF you do pick up part of your neighbours house or the street with you CCTV it is important to look at all the areas in the footage if you have an alert as you never know if you may of caught something important on camera. If you do notice something suspicious on camera then you need to reort it to the police.