guardrail (n.)

• aegis
• backstop
• buffer
• bulwark
• bumper
• contraceptive
• copyright
• cushion
• dashboard
• dodger
• fender
• fuse
• goggles
• governor
• guard
• handrail
• helmet
• insulation
• interlock
• lifeline
• mask
• mudguard
• pad
• padding
• palladium
• patent
• pilot
• preventive
• prophylactic
• safeguard
• safety
• screen
• shield
• umbrella
• windscreen
• windshield