First of all You must have the grappling hook for this one to work. Use the following trick to easily escape or get over barriers fast. If you find yourself outnumbered or on low health and need to get out of an area quickly, run and find a corrugated steel wall or any other high barrier. Throw the hook over the top. Climb over and the game will instantly transport you to the other side . As you run away, press [G] to gather up the hook and delay the pursuers greatly. The majority of times, the enemy will just give up chasing you.
Drive a forklift
When You are on the Night Flight level in multi-player mode, when you start on the helipad, there is a flag directly south of you. Enter one of the warehouses just south and near the flag. Inside is a forklift that you can drive around.