TL-1 Barrier Rating – Technical Specification Guide

Test Level Overview

Parameter	Specification	Tolerance	Purpose
Test Speed	50 km/h	+2/-0 km/h	Basic containment
Impact Angle	25 degrees	±1.5°	Standard impact
Vehicle Mass	2,270 kg	±45 kg	Design vehicle
Impact Energy	41.4 kJ	±2 kJ	Minimum absorption
Deflection Limit	1.0m	+0.2m	Working width

Vehicle Test Requirements

Vehicle Type	Mass (kg)	Speed (km/h)	Angle (°)	Occupant Risk
Pickup Truck	2,270	50	25	Low severity
Passenger Car	1,100	50	25	Low severity
Small Car	820	50	20	Low severity

Performance Criteria

Criterion	Requirement	Measurement	Acceptance
Vehicle Containment	No override	Visual/Video	Pass/Fail
Vehicle Stability	No rollover	Sensors	Pass/Fail
Occupant Impact	≤12 m/s	Accelerometer	Maximum
Exit Angle	≤60% entry	Tracking	Maximum
Debris Scatter	Limited	Zone measure	Controlled

Barrier Types Meeting TL-1

Barrier Type	Height (mm)	Width (mm)	Application
W-Beam	706	180	Rural roads
Box Beam	686	150	Urban streets
Cable	750	200-300	Wide medians
Concrete	810	450	Limited space
Portable	800	600	Temporary

Installation Parameters

Parameter	Specification	Tolerance	Verification
Post Spacing	1.905m	±25mm	Measure
Foundation Depth	0.9m	±50mm	Inspection
Height	As designed	±25mm	Level check
Alignment	String line	±20mm	Survey
Ground Condition	Stable soil	N/A	Soil test

Maintenance Requirements

Component	Frequency	Check Points	Action
Hardware	6 months	Tightness	Adjust/Replace
Posts	Annual	Alignment	Straighten
Rail Elements	6 months	Damage	Repair/Replace
Foundation	Annual	Stability	Reinforce
Connections	Quarterly	Security	Tighten

Repair Criteria

Damage Type	Tolerance	Action	Timeline
Dents	<75mm	Monitor	Next inspection
Tears	Any	Replace	1 week
Misalignment	>50mm	Realign	1 month
Post Damage	Any	Replace	2 weeks
Foundation Issue	Any	Repair	1 month

Documentation Requirements

Document	Content	Update	Distribution
Installation Record	As-built details	Per install	Project file
Inspection Reports	Condition status	Per check	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