Ground Force - Forza Horizon 4

Get 3 Stars at a Danger Sign in a vehicle from the Trucks Car Type - 20

The follow list of Vehicles are Truck Types;

Mercedes-Benz #24 Tankpool24 Racing Truck - 2015

Mercedes-Benz Unimog U5023 - 2014

Volvo Iron Knight - 2016

I recommend the Volvo Iron Knight as it is faster and easier to control when upgrading.

I used the Ambleside Edge Danger Sign Jump, which is slightly North-West of the Horizon Festival Site. Start from the end of the dirt road before the Jump, floor the accelerator towards the jump and fly off the edge. If you don't have this Danger Sign Jump unlocked, you'll have to get more stars in previously unlocked danger sign jumps.

The Ambleside Edge Jump Star Rating:

1 Star - 76m (249.344ft)

2 Stars - 137m (449.475ft)

3 Stars - 198m (649.606ft)

I was able to get a 3 star score at 282m (925.197ft), with no upgrades, using the Iron Knight.

This is a reference to the Gardening Makeover TV Show, Ground Force, professional TV Show Presenter/Gardeners who makeover people's gardens in secret. The TV Presenters always turn up in a Truck with Ground Force on the front and side of it.

Volvo Iron Knight - 2016