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Side collisions at intersections account for 30-40 % in vehicle-to-vehicle accidents in most countries. Side collisions usually become unavoidable due to human response time even though drivers in collided vehicles perceive an imminent risk of collision. Side collisions at intersections become often fatal because impacted vehicles have little space to absorb impact energy. Vehicle manufacturers utilize side airbags and curtain airbags to mitigate injuries to occupants in impacted vehicles to overcome structural design constraints. In the past decade advanced technologies become available to improve vehicle safety. For example, a cruise control system adopted radar technology from aero industry, evolved into an adaptive cruise control system and further into automatic emergency brake system.