Solomon Islands Tyre Rules 2026: 1.5 mm, No Winter

Nothing in Solomon Islands traffic rules asks for a winter tyre, a snowflake marking or a stud, and nothing in the climate ever will — this is a hot, humid tropical archipelago a few degrees south of the equator.

The tread figure applied here is 1.5 mm in the main grooves, the same minimum New Zealand uses; the broader international benchmark is 1.6 mm under Council Directive 89/459/EEC. Neither number is a target. On wet coral gravel it is the point at which a tyre has already stopped working.

Tyre Law Summary for the Solomon Islands

Coral gravel is its own surface

Outside Honiara most roads are coral or crushed rock rather than asphalt, and coral behaves unlike ordinary gravel:

• Dry, it packs hard and fast. The surface can feel like a sealed road, which encourages speed the loose top layer does not support.
• Wet, it turns greasy. The fines lift and the tyre rides on a thin slurry. Braking distances stretch out in a way that is not obvious until you try.
• Fragments are sharp. Coral shards lodge in tread grooves and work their way in, and they cut sidewalls on the shoulder where the road edge drops away.

Clear stone out of the tread after every unsealed run and check both sidewalls, including the inner face.

Driving on the left

Traffic keeps left. For visitors from right-hand-drive countries the risk is not the first hour but the fourth, when concentration drops and the car drifts toward the left verge — which on most Solomon Islands roads is unsealed and edged with coral. That is the single most common way a hire car loses a tyre here.

Wet season and cyclones

From roughly November to April the islands are in the South Pacific cyclone season. Rain falls hard rather than steadily:

• Fords that were ankle-deep in the morning can be running by afternoon.
• Road edges wash out, and the damage is often invisible under standing water.
• Slope debris lands on the carriageway on the inland sections of Guadalcanal.

Tread depth buys you braking and steering in the wet. It does not buy you a river crossing — that is a timing decision.

No borders to plan for

The Solomon Islands share no land border with any country. The nearest road networks belong to Papua New Guinea and Vanuatu, both reachable only by sea or air, and neither of them operates a winter tyre season either. Moving a vehicle between islands within the country is also a shipping question rather than a driving one.

Speed limits, licence requirements and equipment rules are in the Driving in the Solomon Islands guide.