Guardian 5 (G5) Longitudinal Barrier
Guardian 5 (G5) is a MASH TL-5 longitudinal median highway barrier designed to safely capture and redirect a fully loaded 80,000 lb. vehicle. It is intended for use on roadways with high truck traffic where drainage is a concern and as bridge pier protection. G5 is a softer, safer, more cost-effective alternative to concrete highway barriers and meets all MASH TL-5 standards.
As a high-performance highway barrier system, Guardian 5 helps transportation agencies and contractors improve roadside safety while reducing maintenance and lifecycle costs. Its steel design offers a flexible alternative to traditional concrete highway barriers for median protection, roadside shielding, and critical infrastructure protection.
Our highway road safety barriers are strong, long-lasting, and easy to install. And when you partner with Gregory Highway—the national leader in highway guardrail systems and roadside safety—you will always get a quick turnaround and responsive service.
G5 Features
- Meets MASH TL-5 standards
- Used for roadside or median applications
- Bi-directional median or longitudinal barrier
- Galvanized, high strength steel construction
- Direct driven in standard AASHTO strong soils
- Maximum dynamic deflection of 4’4”
- Working width of 5’5”
- Easy to install with standard equipment
- Integrated anchorage system within the length of barrier
- Open-bottom design allows for drainage and easy snow removal
- Common rail profiles are quickly replaceable after impact
- Transitions to standard AASHTO W-Beam or Thrie-Beam highway guardrail systems
- Cost-effective alternative to concrete highway barriers
Simulations for Specific Roadway Applications
- Reduced post spacing
- Higher impact speeds
- Use with curbing
- Use with glare screening
- Direct transition to Ontario shape concrete median barrier
- Analysis of impact envelop; tractor vs. trailer
| Test Level | Vehicle Type | Mass | Speed | Angle | Impact Energy | |||
| MASH | Kg | Lb | Km/h | MPH |
| kJ | Kip-ft | |
| Test 5-12 | Tractor Truck | 36,000 | 79,400 | 80 | 50 | 15° | 595 | ~440 |
| Test 5-11 | Pickup Truck | 2,270 | 5,000 | 100 | 62 | 25° | 156 | ~116 |
| Test 5-10 | Small Car | 1,100 | 2,425 | 100 | 62 | 25° | 75 | ~56 |
