High-Speed Vehicle Collissions (5e Variant Rule)

High-Speed Vehicle Collisions

The 5e rules were not thought up with the existence of modern vehicles in mind, so there's no existing system to resolve what happens in a scenario such as a person being struck by a speeding car at 80 miles per hour besides simply guessing. The goal of this rule is to establish a set of guidelines to address this.

Classes of Vehicles

Six weight categories of vehicles exist:

• Light Vehicle: Motorcycles and other very light vehicles.
• Medium Vehicle: Most cars, small trucks, and minivans.
• Heavy Vehicle: Jeeps, larger trucks, and full-sized vans.
• Very Heavy Vehicle: Buses, semi trucks, and APCs.
• Extremely Heavy Vehicle: Tanks.
• Massive Vehicle: Train locomotives.

Collisions

A high-speed collision happens when a vehicle strikes a creature or object (including another vehicle) at a minimum speed of 10 miles per hour, or 100 feet per round. Roll damage once based on the table below; the creature or object takes full damage from the collision, while the vehicle takes damage based on the size category of whatever it collided with. If it's three or more size categories smaller (e.g. a gargantuan vehicle colliding with a medium creature), the vehicle takes 1/10 damage. If it's two size categories smaller, the vehicle takes 1/4 damage. If it's one size category smaller, the vehicle takes 1/2 damage. If it's the same size or larger, the vehicle takes full damage.

Speed (mph/feet per round)	Light Vehicle	Medium Vehicle	Heavy Vehicle	Very Heavy Vehicle	Extremely Heavy Vehicle	Massive Vehicle
10 mph/100 ft.	1d6	1d8	1d10	1d12	6d12	12d10
20 mph/200 ft.	2d6	2d8	2d10	2d12	7d12	14d10
30 mph/300 ft.	3d6	3d8	3d10	3d12	8d12	16d10
40 mph/400 ft.	4d6	4d8	4d10	4d12	9d12	18d10
50 mph/500 ft.	5d6	5d8	5d10	5d12	10d12	20d10
60 mph/600 ft.	6d6	6d8	6d10	6d12	11d12	22d10
70 mph/700 ft.	7d6	7d8	7d10	7d12	12d12	24d10
80 mph/800 ft.	8d6	8d8	8d10	8d12	13d12	26d10
90 mph/900 ft.	9d6	9d8	9d10	9d12	14d12	28d10
100 mph/1,000 ft.	10d6	10d8	10d10	10d12	15d12	30d10
120 mph/1,200 ft.	11d6	11d8	11d10	11d12	16d12	32d10
140 mph/1,400 ft.	12d6	12d8	12d10	12d12	17d12	34d10
160 mph/1,600 ft.	13d6	13d8	13d10	13d12	18d12	36d10
180 mph/1,800 ft.	14d6	14d8	14d10	14d12	19d12	38d10
200 mph/2,000 ft.	15d6	15d8	15d10	15d12	20d12	40d10
240 mph/2,400 ft.	16d6	16d8	16d10	16d12	21d12	42d10
280 mph/2,800 ft.	17d6	17d8	17d10	17d12	22d12	44d10
320 mph/3,200 ft.	18d6	18d8	18d10	18d12	23d12	46d10
360 mph/3,600 ft.	19d6	19d8	19d10	19d12	24d12	48d10
400 mph/4,000 ft.	20d6	20d8	20d10	20d12	25d12	50d10

5.00

(one vote)

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