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 |
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