Oversize Vehicle Regulation Requirements

Posted 30th August 2018

Required Signage for Oversize Vehicles

Getting the right signage for your over dimension vehicles is now essential to fit all the legal requirement of agricultural and commercial work. 

Different Overdimension Hazard Panel Options

tRANSQUIP - Hazard Panels

• Must be reflective yellow-green with a reflective orange diagonal stripe (see diagrams below).

• These hazard panels are preferred over flags as the panels are more visible during both day and night.

• In New Zealand only the above New Zealand style hazard panels are allowed These consist of retro-reflective material coloured yellow-green with either a 200mm- or 300mm-wide diagonal orange stripe. Red and white hazard panels must not be used.

• Only use hazard panels when required to – do not leave them displayed on the vehicle when the vehicle is not oversize.

• Comply with AS/NZ 1906.1: 2007 Retro reflective materials and devices for road traffic control purposes, Part 1: Retro reflective materials.

• Have the illustrated dimensions and orientation, shown below.

• Be frangible (breakable or readily deformable) if any part of the hazard warning panel extends beyond the body of the vehicle or the load, whichever it is attached to.

Note: Instead of displaying a hazard warning panel, an agricultural tractor with a width not exceeding 3.1m may instead be fitted with and use an amber beacon when operated on a road.

Hazard Panel Location

The following example shows the correct hazard panel location and orientation. Panels show the excess dimensions to other road users and are visible from the front and rear or to the side for front and rear overhang.


tRANQUIP Hazard Panel Location - 2


If the vehicle is more than 3.1 metres wide, Oversize signs must be displayed at the front and rear.

Heavy Vehicle Safety Flag Requirements and Usage

• The flags must be fluorescent yellow, 400mm long × 300mm high.

• Must only be used if the vehicle is over dimension – take the flag off if the vehicle or load is no longer over dimension.

• Should be fitted in a way that indicates the over dimension extremes of the vehicle.

• High visibility paint may be used to draw attention to excess front overhang, for example, the sides of the bucket of a front end loader. The use of paint in this way recognises that attaching flags or hazard panels to certain types of projecting equipment is not always practical.

• You may use retro-reflective hazard panels coloured yellow-green with an orange diagonal stripe instead of flags.

• If you’re travelling during the hours of darkness, the flags must be replaced with retro-reflective yellow-green hazard panels with an orange diagonal stripe.

Fluorescent Yellow Overdimensional Flags must be attached to indicate the:

· Excess width of the vehicle or load at its front and rear

· Front of the load (if it has excess front overhang)

· Rear of the load (if it has excess rear overhang)

· Rear of the load (if it has excess length).

Oversize Sign:

• The oversize sign must have black lettering on yellow-green background (see diagram below)

• It may be in two parts: OVER and SIZE

• Must be visible to both the front and the rear

• Only use oversize signs when required to. Do not leave them displayed on the vehicle when the vehicle does not require them.


tRANQUIP Hazard Panel Location - 3