Along with a SWAT outfit, police cruiser and assault rifle, the Police Protection Pack includes a short, repeatable mission where you shoot enemies while leaning out the passenger window of a cop car. It's not worth $2.99, especially if you have the Triad Enforcer Pack which already includes the exact same type of mission.

This is my playthrough of the Police Protection Pack downloadable content for Sleeping Dogs on the PC. I bought the DLC for $0.74 during a 75% off sale that Steam was having.

This footage is taken from a livestream I did over on Twitch.tv.