These challenges unlock gears for Explosive Mods. You'll be driving a bomb-strapped vehicle which you need to maintain minimum speed if you don't want to explode. Your goal is to deliver your payload to the marked target as fast as you can and by jumping out of the vehicle in the last moment.
Unlock by: Liberate Soliana
The path is pretty much straightforward which will require you to follow the main road up until the last turn to the base. To reach the targets, veer off the road to the outpost and straight to the group of targets.
Unlock by: Liberate Olivo Moro
You’ll be driving a very slow and rigid van. You may also pick up heat along the way so you’ll have armed pursuers shooting at you and will try to push you off the road. Just stay on the road and above bumps to avoid getting veered out of control.