These are the most direct routes for each mission.

#Mission 1

#Mission 2

#Mission 3 When cutting through Hyde Park (which isn't marked on the original map) there's a path that cuts through the one you're driving on, I've marked these as black, just go straight.

#Mission 4 Two black dots mark the armored trucks' route and you must destroy it before it reaches the second one.

Regardless of how quickly you destroy the truck, you will always be placed at the location marked "2" and always be facing the same way, so just drive straight.

#Mission 5

#Mission 6

#Mission 7 The longest mission in the game, the only real difficult part is when cutting through Soho (the red route going to the van), one wrong turn and it can be difficult to get back on track.

Once again black dots marking the two points where you must destroy the other van (like the armored truck in mission 4), you can destroy it in as little as 2 hits though, so much easier.

After rescuing Yasmin, take a left, then a right and just go straight.

#Mission 8

#Mission 9 No need to take Yasmin to Charlie's, take her with you to the Crack House. Potential Yasmin Clones glitch can happen with all NPCs but doesn't affect the completion of the mission.

#Mission 10

#Mission 11

#Mission 12