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Figured out why, and might help some others maybe. Although I don't think it's mentioned above, you need to use the PoliceLifeSLauncher.exe to launch the game, downloaded from the website.
On a few occasions I've requested a Tow and the truck has become stuck or spawned in a location it cannot path out of (for example on the other side of the golf course fencing), even when destroying the truck the marker remains on the map, and driving far away doesn't cause the truck marker to disappear, is it possible to add a 'cancel tow' option?