Final answer:
A safety barrier can absorb the impact of a secondary crash to protect rescuers. It is designed to prevent further damage or injury during emergency situations.
Step-by-step explanation:
A safety barrier can be defined as an object that can absorb the impact of a secondary crash to protect rescuers. It is designed to prevent further damage or injury during emergency situations. Safety barriers are often used in road construction areas or accident scenes to create a physical barrier between traffic and the rescue personnel.