d20 Modern :: Combat :: Vehicle :: Vehicle Movement And Combat

Resolving Collisions

The base damage dealt by a vehicle collision depends on the speed and size of the objects involved. Use the highest speed and the smallest size of the two colliding objects and refer to Table: Collision Damage.
Table: Collision Damage
Highest Speed
Damage Die Type
Alley speed
d2
Street speed
d4
Highway speed
d8
All-out
d12
Smallest Object or Creature Size
Number of Dice
Colossal
20
Gargantuan
16
Huge
12
Large
8
Medium-size
4
Small
2
Tiny
1
Smaller than Tiny
0
After finding the base damage, determine the collision's damage multiplier based on how the colliding vehicle struck the other vehicle or object. (For vehicles moving in reverse, consider the back end to be the vehicle's "front" for determining the collision multiplier.) Consult Table: Collision Direction for a multiplier.
Once the damage has been determined, apply it to both vehicles (or objects or creatures) involved in the collision. Both vehicles reduce their speed by two speed categories. If the colliding vehicle moved the minimum number of squares for its new speed category before the collision, it ends its movement immediately. If not, it pushes the other vehicle or object aside, if possible, and continues until it has moved the minimum number of squares for its new speed category.
Table: Collision Direction
Colliding Vehicle's Target
Multiplier
A stationary object
x 1
A moving vehicle, striking head-on or 45 degrees from head-on
x 2
A moving vehicle, striking perpendicular
x 1
A moving vehicle, striking from the rear or 45 degrees from the rear
x 1/2
A vehicle being sideswiped (see Sideswipe)
x 1/4
The driver of the vehicle that caused the collision must immediately make a Drive check (DC 15) or lose control of the vehicle (see Losing Control, below). The driver of the other vehicle must succeed on a Drive check (DC 15) at the beginning of his or her next action or lose control of his or her vehicle.
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