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Section LL – Motorcycle & Trike Modifications

Compliance for ADR Category L-Group Vehicles

Overview

Section LL of the National Code of Practice VSB 14 outlines the minimum design, fabrication and installation requirements for motorcycles and three-wheeled vehicles that have been modified after first registration.

It does not apply to the construction of Individually Constructed Vehicles (ICVs) — these must follow Section LO.

What Does Section LL Cover?

Section LL applies to:

  • Two-wheel motorcycles (ADR category LA, LB, LC, LD)
  • Motor tricycles and three-wheeled vehicles (LEM1 and LEP1)
  • Modifications That Don’t Require Certification
  • The following are allowed without certification, provided the general requirements are met:
  • Installing manufacturer’s optional components (e.g. engine, transmission, exhaust)
  • Converting from two-seater to single-seater configuration
  • Restoring single-seaters back to original two-seater setup

⚠️ All modifications must comply with the Australian Vehicle Standards Rules (AVSR) and original ADRs.

Design & Safety Requirements

Every modified motorcycle must:

  • Maintain safe handling, braking and lighting
  • Avoid creating a hazard or nuisance
  • Retain sufficient ground clearance (minimum 100mm)
  • Comply with clear dimensions and projection limits for components and accessories

Additional requirements include:

  • Brake system integrity and visibility
  • Mudguards on all wheels
  • Chain or drive guards
  • Handlebar height and width limits
  • Properly mounted foot pegs and mirrors
  • Exhaust and noise limits per ADR 39/83
  • A working horn and calibrated speedometer (post-1988 models)

Seat Conversions

Converting to Single Seater:

  • Upholstered seat section must be under 500mm long
  • Pillion foot pegs and brackets must be removed
  • No sharp edges or exposed fittings

Reverting to Two-Seater:

  • Restore seat to original spec or equivalent
  • Refit pillion pegs in factory positions
  • Avoid welding or oxy-cutting when re-attaching parts

Certified LL Mod Codes

There are currently no certified modification codes under Section LL.
For trike construction or significant structural changes, refer to Section LO – ICV Requirements.

Need Assistance?

At Autocert, we can:

  • Confirm compliance of your motorcycle or trike
  • Perform visual inspections and issue reports
  • Guide you on the correct process for any modifications
    We service the greater Brisbane area and are fully authorised under Queensland’s Approved Person Scheme.