Converse of object

• have: Elevated surfaces such as platforms, ramps, and bridges should have guardrails that would prevent accidental falls.

• use: Follow the best trajectories by using the guardrails, but watch out because your opponents are gunning for you.

Adjective modifier

• pedestrian: Don't attach fly-posters or advertising banners to pedestrian Guardrail.

• secure: All structures require secure guardrails at any place where a person might fall two meters or more.