Danger Signs in Forza Horizon 4 are special challenges in which you have to make a jump from a special ramp and fly as far as possible in the air. It is important to land correctly, otherwise the jump will not be scored. The distance achieved will be rated with 1-3 stars. More ramps are unlocked as you gain higher "Danger Sign Hero" levels.
Level 1 - Ambleside Edge250 FT / 450 FT / 650 FT
Level 2 - Open-Cast Cliff500 FT / 725 FT / 950 FT
Level 3 - Reservoir Ridge250 FT / 400 FT / 550 FT
Level 3 - The Great Ridge350 FT / 675 FT / 900 FT
Level 3 - Whitewater Falls300 FT / 400 FT / 500 FT
Level 4 - Rail Yard Ramp300 FT / 500 FT / 700 FT
Level 4 - Rannoch Shelf350 FT / 450 FT / 550 FT
Level 4 - Roman Ruins200 FT / 375 FT / 550 FT
Level 5 - Arthur's Seat250 FT / 425 FT / 600 FT
Level 5 - Bamburgh Castle300 FT / 500 FT / 700 FT
Level 5 - Swan Dive400 FT / 575 FT / 750 FT
Level 6 - Mam Tor250 FT / 625 FT / 1,000 FT
Level 6 - Mudkickers' Showjump200 FT / 475 FT / 700 FT
Level 6 - Northbound250 FT / 475 FT / 700 FT
Level 7 - Broadway Windmill250 FT / 725 FT / 1,200 FT
Level 7 - Hilltop Vista350 FT / 475 FT / 600 FT
Level 7 - Leap of Faith200 FT / 300 FT / 400 FT
Level 7 - Outcrop Crest300 FT / 450 FT / 600 FT