GMC Hummer EV “CrabWalk” – When a Truck Moves Sideways

GMC has done something that looks like it belongs in a sci-fi film rather than a pickup truck brochure.

On its flagship electric monster the GMC Hummer EV there’s a feature called CrabWalk.

At first glance, it sounds like marketing hype.

Then you see it in action.

And it stops making sense in the best possible way.

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What is CrabWalk?

CrabWalk is not just rear-wheel steering.

It’s something more unusual:

All four wheels steer in the same direction at low speed, allowing the vehicle to move diagonally.

Instead of the front wheels turning left and the rear wheels turning slightly opposite (as in traditional rear steering systems), the Hummer EV can align all wheels so the truck literally “walks sideways.”

That’s where the “crab” name comes from like a crab moving along the beach, body facing forward while motion goes sideways.

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How CrabWalk actually works

Under the surface, CrabWalk is enabled by a four-wheel steer-by-wire system and advanced electronic control of steering angles.

At low speeds:

• Front wheels turn in a chosen direction
• Rear wheels turn in the same direction
• All four wheels point diagonally
• The vehicle moves sideways at an angle

This is fundamentally different from standard rear-wheel steering systems, which usually just tighten turning radius.

Instead of “helping you turn,” CrabWalk changes the direction of travel itself.

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Why it feels so strange to watch

Most people’s brains are trained on a simple rule:

Wheels turn → vehicle rotates → vehicle moves forward along curve.

CrabWalk breaks that expectation.

Instead of pivoting, the vehicle translates sideways while still pointing forward.

The first time you see it, it almost looks edited like someone slid the truck in post-production.

But it’s real physics, just applied in a very unconventional way.

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What makes it useful?

CrabWalk isn’t just a party trick. It actually has practical advantages:

1. Tight trail positioning

On off-road terrain, especially narrow rock paths or forest trails, being able to shift sideways slightly can help:

• avoid obstacles without multiple forward-reverse corrections
• align tires precisely on uneven terrain
• reduce risk of scraping wide body panels

2. Difficult parking situations

In theory (and sometimes in practice), diagonal movement helps:

• angle into tight off-road parking spots
• adjust position without full steering cycles
• reduce multi-point maneuvers

3. Off-road control

The GMC Hummer EV is extremely wide and heavy. CrabWalk helps compensate for that size by offering movement flexibility traditional trucks simply don’t have.

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Rear-wheel steering vs CrabWalk

Rear-wheel steering has existed for years in performance cars and trucks.

But it works like this:

• Low speed: rear wheels turn opposite front wheels → tighter turning radius
• High speed: rear wheels turn slightly with front wheels → stability

CrabWalk goes further.

Instead of improving a turn, it creates a new type of motion entirely:

System	Movement type
Rear-wheel steering	Curved turning
CrabWalk (4-wheel diagonal steering)	Linear sideways motion

That difference is why it feels so “impossible” at first.

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Why it looks like cheating physics

What makes CrabWalk visually confusing is that the truck:

• keeps its body orientation forward
• but changes its direction of travel
• without rotating like a normal vehicle

It creates a mental contradiction:
the truck is facing one way, but moving another way.

In reality, it’s just coordinated steering geometry combined with low-speed control logic but the effect is dramatic.

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The “wow factor” matters too

Even if you never use CrabWalk in daily life, it changes perception of what a pickup truck can do.

The GMC Hummer EV already challenges expectations as an electric super-truck, and CrabWalk pushes it further into showcase territory.

It’s the kind of feature that:

• gets filmed immediately
• goes viral in seconds
• makes engineers proud and drivers slightly confused

Because let’s be honest: it looks like something that shouldn’t be possible with four wheels and a chassis that size.

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Final thoughts

CrabWalk is not essential for everyday driving.

It’s not even something most owners will use regularly.

But it represents a bigger shift in automotive design:

Vehicles are no longer limited to forward-and-backward thinking.

With systems like CrabWalk, motion becomes multidirectional and the idea of how a “truck moves” starts to change completely.

Rear-wheel steering made cars more agile.

CrabWalk made them weird in the most fascinating way possible.

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