Although vehicles you find are useful for getting around the map quicker they are best avoided as it's very easy to hit the driver even if you're not a sharpshooter. This is due to the targeting assistance system which activates while aiming a weapon. The only exception to this is the blue pickups which have a fully enclosed cab which makes it impossible to use the automatic aiming option to shoot the driver. A big disadvantage with using vehicles is they are noisy which makes it easy for enemies to locate you.
