Towing implements: width, overhang and lighting

Measure the transport configuration

A folded cultivator, rear-mounted drill and laden grain trailer present different road risks. Record the widest point, overall height, combination length and projections in the precise configuration that will be used on the road. Include tyres, guards and equipment that sits outside the tractor body.

Do not treat a manufacturer's working width as the transport width. Lower or fold equipment only as the manufacturer specifies, engage transport locks and check hydraulic or mechanical locking devices. A supported implement must remain secure if hydraulic pressure is lost.

The Great Britain rules distinguish vehicle dimensions from projecting loads and distinguish ordinary vehicles from special-type agricultural movements. Northern Ireland uses separate legislation. Establish which regime covers your specific machine before applying a threshold.

Wide agricultural vehicles: notification and attendants

Under STGO article 24, width over 3.0 metres requires police notification if any road on the journey has a speed limit of 40 mph or less, or if the journey exceeds 5 miles. The limited exception is a journey not exceeding 5 miles with no road subject to a limit of 40 mph or less. Width includes lateral projections. Above 3.5 metres, attendants are required; Part 3 authorises width only up to 4.3 metres.

Schedule 5 gives agricultural notices a specific timetable: receipt must be before the beginning of the 24-hour period ending immediately before the date of use, unless police accept shorter notice. Notify each relevant police area and check its directions. This is not the ordinary projecting-load rule of two clear working days. An attendant is the legal requirement, not automatically a police escort; Schedule 6 sets training, visibility and communication conditions.

Article 22 also restricts towing in certain configurations exceeding 3 metres. Its exceptions include agricultural trailed appliances and certain equipment or harvesting trailers. Do not assume a wide tractor may tow an ordinary laden produce trailer simply because notice has been given.

Measure the attached implement or trailer as well as the tractor. Offset-towed combinations are measured as if one vehicle under the Order. Notification and attendants do not override bridge limits, closures or inadequate clearance.

Front, rear and sideways projections are separate checks

An implement can meet an overall width condition yet still have a dangerous front or rear projection. Projecting-load requirements under Construction and Use regulation 82 and Schedule 12 can involve end or side markers, attendants and police notice. The requirements depend on the projection, the kind of load and the applicable vehicle regime; an agricultural exemption is not a universal exemption for every implement or projecting load.

Measure front and rear projections from the legally relevant reference point, not from whichever part of the cab is easiest to reach. For side projections, identify how far the equipment or load extends beyond the vehicle body. Check the current consolidated rules with a competent adviser for the exact configuration, particularly where a long implement, bale load or front-mounted attachment extends beyond the normal silhouette.

Before turning out of a field, consider the front attachment's reach into the carriageway and the rear implement's tail swing. On bends a trailer may cut inside the tractor's path while a long rear overhang swings outside it. Keep sharp points guarded where required and avoid exposing other road users to dangerous parts.

• Record front, rear and side projections separately from overall length and width.
• Identify whether the projection is part of the vehicle, mounted equipment or a carried load.
• Confirm which statutory marking, notice and attendant requirements apply before movement.
• Check the entrance and exit turns, including tail swing, before committing to a narrow road.

Agricultural STGO projection thresholds

For an eligible agricultural movement under STGO Part 3, article 23 and Schedule 8 set the following cumulative requirements. Establish eligibility first; these are not interchangeable with the ordinary Construction and Use projecting-load rules.

Additional side-marker arrangements apply for front projections over 4.5 metres or rear projections over 5 metres. Markers must be clean and unobscured and illuminated with suitably shielded lamps between sunset and sunrise or when visibility is seriously reduced. Lateral projections over 305 mm require the prescribed side markers visible from front and rear; specified conspicuity tape is an alternative only where fitting the prescribed markers is shown not reasonably practicable.

Ordinary projecting-load rules are different

DfT's ordinary Construction and Use summary requires a clearly visible end for rear projections over 1 metre and up to 2 metres, marker boards for rear projections over 2 metres and up to 3.05 metres, and marker boards plus an attendant for front projections over 2 metres and up to 3.05 metres. Front or rear projections over 3.05 metres require boards, an attendant and two clear working days' police notice.

Those are ordinary-load conditions, not the agricultural STGO table above. The legal classification of mounted equipment, trailed appliances and loads determines the applicable regime. Absence of a marker requirement in one table does not remove lighting or general safety duties.

Lights and reflectors must still be visible

A trailer or implement must not hide the lighting and reflectors needed for lawful road use. If equipment obscures the tractor's rear lights, fit a suitable lighting board or the required equipment-mounted lamps and reflectors for that configuration. Exact obligations depend on vehicle type, age and use under the Road Vehicles Lighting Regulations; do not assume an old trailer has the same requirements as a new one.

Before departure, check rear position lamps, stop lamps, indicators and relevant reflectors, plus the visibility and illumination of the registration plate where required. Inspect connections with the equipment attached. Clean lenses and reflectors after field work; a working bulb behind mud is not useful to following traffic.

Width and projecting-load rules can require additional markers or lamps. Work lights are not a substitute for correctly positioned road lamps and must not dazzle other drivers. A bright beacon likewise does not replace indicators, brake lights or reflectors.

Projection lighting has its own measurement rules

Lighting regulation 21 requires specified additional white front lighting and a white reflector for agricultural front projections over 2 metres, and red rear lighting and a red reflector for rear projections over 2 metres, in the applicable lighting conditions. Lateral lighting tests use 400 mm measured relative to the illuminated area of the position lamp, not the 305 mm body-projection marker threshold.

Obscured obligatory stop lamps and indicators must be dealt with in all circumstances, not only after dark. The regulation contains separate timing and visibility provisions for other lights and reflectors. Check the precise requirements for your configuration rather than relying on a single lighting-board rule.

When an amber warning beacon is required

Lighting regulation 17 requires a showing amber beacon for the specified motor vehicles with four or more wheels and a maximum speed not exceeding 25 mph on unrestricted dual carriageways, subject to its exceptions. The beacon must show amber light. DfT describes a vehicle-mounted lamp centre at least 1,200 mm above ground, or a trailer-mounted beacon visible from any point at a reasonable distance from the combination.

Check whether a rear load or tall implement blocks the beacon. Other movement conditions may also require warning equipment. This is not a universal requirement to use a beacon on every tractor journey. Use warning lamps lawfully and check the current regulations for the machine's circumstances.

Couplings, brakes and a final walk-round

Check that the hitch, drawbar and coupling are rated for the loaded combination and that pins and retaining devices are secured. Connect and test the appropriate trailer braking system. Inspect air or hydraulic hoses for damage and make sure they cannot snag or pull tight on a sharp turn.

Use the manufacturer's road-transport instructions for PTO guards, folding frames and any front-mounted equipment. Verify actual loaded weights, not merely an equipment name in a catalogue. Stop in a safe place to recheck after attaching unfamiliar or hired equipment; responsibility for roadworthiness remains with the operator.