TL-4 Barrier Rating – Technical Specification Guide

Test Level Overview

Parameter	Specification	Tolerance	Purpose
Test Speed	80 km/h	+2/-0 km/h	Heavy vehicle containment
Impact Angle	15 degrees	±1.5°	SUT impact
Vehicle Mass	8,000 kg	±100 kg	Design vehicle
Impact Energy	209.3 kJ	±7 kJ	Energy absorption
Deflection Limit	1.5m	+0.3m	Working width

Vehicle Test Requirements

Vehicle Type	Mass (kg)	Speed (km/h)	Angle (°)	Exit Box Criteria
Single Unit Truck	8,000	80	15	Required
Pickup Truck	2,270	100	25	Required
Passenger Car	1,100	100	25	Required
Test Article	N/A	N/A	N/A	No penetration
Occupant Risk	THIV ≤33 ft/s	PHD ≤20g	ASI ≤1.4	Required

Performance Criteria

Criterion	Requirement	Measurement	Acceptance
Structural Adequacy	A,D	No penetration	Pass/Fail
Occupant Risk	D,F,H,I	Within limits	Pass/Fail
Vehicle Trajectory	L,M	Controlled exit	Pass/Fail
SUT Stability	G	No rollover	Pass/Fail
Working Width	W5 max	≤1.5m	Measure

Compliant Barrier Systems

Barrier Type	Height (mm)	Width (mm)	Strength Rating	Application
F-Shape Concrete	1070	610	209.3 kJ	Bridges/Highways
Single Slope	1070	610	209.3 kJ	High risk areas
Vertical Wall	1070	450	209.3 kJ	Limited space
Modified Thrie Beam	915	245	209.3 kJ	Transitions
Heavy Post W-Beam	813	180	209.3 kJ	Special applications

Installation Requirements

Parameter	Specification	Tolerance	Verification
Foundation	200mm Type 1	±25mm	Compaction test
Alignment	String line	±15mm	Survey check
Level	Design grade	±10mm	Digital level
Joint Width	20mm	+10mm/-5mm	Gap measure
Anchoring	As designed	±5mm	Template check

Maintenance Schedule

Component	Frequency	Check Points	Action Required
Structure	Monthly	Damage/cracks	Document/Repair
Joints	Quarterly	Integrity/alignment	Adjust/Replace
Anchors	Semi-annual	Tightness/corrosion	Tighten/Replace
Drainage	Monthly	Blockage/flow	Clean/Repair
Transitions	Quarterly	Connection/alignment	Adjust/Repair

Repair Criteria

Damage Type	Assessment	Action	Timeline
Structural Damage	Any	Replace unit	24 hours
Surface Spall	>75mm	Patch repair	1 week
Joint Damage	Any	Replace hardware	48 hours
Alignment	>25mm	Realign	1 week
Foundation Issue	Any	Investigate/Repair	24 hours

Documentation Requirements

Document	Content	Frequency	Distribution
Installation Record	As-built details	Per install	Project file
Inspection Reports	Condition status	Monthly	Maintenance
Repair Records	Work completed	Per repair	Asset manager
Impact Reports	Incident details	Per event	Safety team
Test Certificates	Compliance data	Per batch	Quality control