Final answer:
The guardrail was reinforced to prevent cars from skidding over the edge of the cliff and falling into the abyss below.
Step-by-step explanation:
The guardrail was reinforced to prevent cars from skidding over the edge of the cliff and falling into the abyss below. The purpose of the guardrail is to provide a barrier that would prevent vehicles from going off the edge and causing accidents. By reinforcing the guardrail, it becomes stronger and more resistant to impact, ensuring greater safety for drivers.