On muddy roads, the advantages of tracked transport vehicles over wheeled ones stem from the fundamental differences in their ground contact methods and structural designs, which are specifically reflected in the following core aspects:

1. Smaller ground pressure, less prone to sinking
   Advantages of tracks:
   Tracks come into contact with the ground through wide track plates, and the ground contact area is much larger than that of the tires of wheeled vehicles (usually 5-10 times that of wheeled vehicles). According to the pressure formula (pressure = weight ÷ contact area), under the same weight, the pressure of tracks on the ground can be reduced to 1/5 or even lower than that of wheeled vehicles. For example, a 10-ton tracked vehicle may have a ground pressure of only 0.05MPa, while a wheeled vehicle of the same weight (with 4 tires) may have a pressure as high as more than 0.3MPa.

Practical effect: On soft roads such as mud and swamps, tracked vehicles can "float" on the surface, reducing the squeezing and sinking of the soil; while wheeled vehicles, due to high pressure, their tires are easy to get stuck in the mud, and even completely "sucked" and unable to move.

2. Stronger grip and more stable power transmission
   Advantages of tracks:
   The surface of track plates is usually designed with deep patterns (such as bumps and transverse ribs), which can be embedded in the soil or grass roots in the mud to form mechanical engagement, providing continuous longitudinal grip and avoiding slipping.

The contact between the track and the ground is "surface contact", and the entire track plate can transmit driving force with little power loss; while wheeled vehicles rely on "point contact" between tires and the ground, and the tire patterns in the mud are easily filled with mud, resulting in a sharp drop in friction, and most of the power is wasted in the form of slipping.

Practical effect: When a tracked vehicle starts, accelerates, and climbs slopes in mud, it can stably output power. Even if part of the track slips, the rest can still provide driving force; wheeled vehicles, on the other hand, are prone to tire idling, unable to effectively transmit power to the ground, and even slip in place, leading to getting stuck.

3. Better adaptability to terrain undulations
   Advantages of tracks:
   The ground contact length of the track is relatively long (usually accounting for more than 60% of the vehicle body length), and it is flexibly connected to the frame through the suspension system, which can better fit the undulations of the muddy road (such as small gullies and mounds), reduce the bumpy of the vehicle body, and maintain stable center of gravity.

The continuous contact characteristic of the track makes it less likely to lose balance due to the fall of a single "support point" when crossing shallow pits and stones in the mud.

Limitations of wheeled vehicles: The tires of wheeled vehicles are discrete support points. If one tire gets stuck in a mud pit, it is easy to cause the vehicle body to tilt, and even other tires to leave the ground, losing driving force.

4. Structural strength is more suitable for complex muddy environments
   Advantages of tracks:
   Tracks are made of high-strength steel or composite materials. Components such as track plates and track links are impact-resistant and wear-resistant, and can withstand scratches and impacts from hidden obstacles such as stones and tree roots in the mud, and are not easy to be damaged.

Limitations of wheeled vehicles: Tires (especially pneumatic tires) are easy to be punctured by sharp objects, blow out in the mud, or the bearings are damaged due to mud entering the wheel hub, so the failure rate is much higher than that of tracked vehicles.

5. More flexible steering mode, not easy to "jam"
   Advantages of tracks:
   Tracked vehicles realize steering through the speed difference between the left and right tracks (for example, the left track decelerates and the right track accelerates to turn left). When turning, the friction between the track and the ground is sliding friction, which has small resistance in the mud. Even if the road surface is soft, it can turn flexibly, and is not easy to get stuck in steering due to uneven ground.

Limitations of wheeled vehicles: Wheeled vehicles rely on the friction of the steering wheels for steering. In mud, the steering wheels are easy to slip, and the steering accuracy decreases; if the tires on one side get stuck in the mud, it may also cause difficulty in steering due to the excessive difference in resistance between the two sides.

Summary
On muddy roads, tracked transport vehicles comprehensively surpass wheeled transport vehicles in passability and reliability through four core advantages: "large area and low pressure" to reduce sinking, "surface contact + deep patterns" to enhance grip, "long ground contact + flexible connection" to adapt to terrain, and "high-strength structure" to resist wear. This is why tracked transport vehicles have become the preferred tool in muddy scenarios such as agricultural fields, mining areas, and swamp rescue.