South Sudan Tyre Rules 2026: Mud Season and 1.6 mm

The seasons here are wet and dry, and only one of them is a driving problem. No winter tyre window applies, no marking is required, and studs are not a category anyone uses.

The tread floor is 1.6 mm in the main grooves, the international reference set out in Council Directive 89/459/EEC. On most of this country it is also the least important number in the vehicle.

Tyre Law Summary for South Sudan

The rains run April to November

For roughly eight months of the year, rain rather than regulation decides where a vehicle can go. The pattern is worth understanding before a route is planned:

• The unpaved network goes from difficult to impassable. Not slower — impassable. Stretches that carry traffic in February are closed by standing water and cut-up clay in August.
• Repairs happen in the dry season. What you drove in January may not be what is there in September, and local knowledge on the day beats any map.
• River crossings dominate the timetable. Low causeways and fords set the route far more than distance does.

Black cotton soil defeats tread pattern

Much of the country sits on heavy black clay. In the dry season it sets like concrete and cracks open; in the wet it becomes a grease that packs a tread solid within a few metres of leaving firm ground.

This is the fact that makes tyre-choice advice from temperate countries useless here. Once the grooves are full there is no pattern left, and depth stops mattering because nothing can reach the surface. What works is an open, self-clearing block pattern with wide voids, the discipline to stop before the vehicle is committed, and a jack with something solid to stand on.

Juba to Nimule is the exception

The sealed corridor running south from Juba towards the Ugandan border carries the bulk of long-distance traffic and behaves like a road in the ordinary sense. It is also where speed and worn tread interact in the familiar way, and where 1.6 mm of remaining depth is genuinely dangerous rather than merely academic.

Away from it, plan for murram, clay and recovery.

Six land borders

• Sudan: to the north. No winter tyre season; tread floor 1.6 mm.
• Ethiopia: to the east, where the ground climbs steeply. No seasonal rule, but the highland nights are genuinely cold.
• Kenya: to the south-east. No winter tyre season; tread floor 1.6 mm.
• Uganda: to the south, on the Nimule corridor. No winter tyre season; tread floor 1.6 mm.
• DR Congo: to the south-west. No winter tyre season; tread floor 1.6 mm.
• Central African Republic: to the west. No winter tyre season; tread floor 1.6 mm.

For speed limits, licence requirements and equipment rules, see the Driving in South Sudan guide.