Track Limits and Surfaces

Most racing games punish going off-line with a physics model: less grip, more slide, maybe a spin. Daily Dirt Rally does something blunter and, once you understand it, far more predictable. There is exactly one boundary that matters — on the racing surface, or off it — and crossing it caps your speed until you return.

The penalty, in numbers

On the dirt, your truck’s speed ceiling is 300 units. The instant the game decides you are off the surface, that ceiling drops to 30% of normal: 90 units. Nothing else changes. Your steering authority, your braking and your acceleration curve are identical; you simply cannot go fast.

The recovery detail is the one that actually costs lap time. The penalty lifts the moment you touch dirt again, but you are then at 90 units and have to accelerate back up. Because thrust tapers off as you approach top speed, climbing from 90 back to 300 takes considerably longer than the excursion itself. A one-second trip through the grass routinely costs two to three seconds of lap time.

Where the edge is

The boundary is not a rectangle around each track tile, and it is not a generous invisible margin. Each of the sixteen track tiles ships with a 16×16 collision mask generated directly from its artwork, and the game tests your truck’s position against that mask. Brown pixels are drivable, green pixels are not.

Two consequences follow, and they are worth internalising:

• What you see is what you get. The ragged edge where dirt meets grass is the real boundary. You can run the outside of a corner right up against the visual edge without penalty.
• There is no forgiveness zone. Games that draw a wide verge and then allow a metre or two of it before punishing you have trained a bad habit. Here, one pixel over is over.

What this means for your line

Because the penalty is a hard speed cap rather than a gradual loss of grip, the optimal line is more conservative than in most arcade racers. Three practical rules:

1. Never cut a corner across grass

The geometric saving from cutting an apex is a few truck lengths. The cost is a drop to 90 units plus the rebuild. On every layout the generator produces, going around is faster than going across. This is the single biggest time loss for new drivers.

2. Sacrifice entry speed to protect exit

Running wide on exit is where most excursions actually happen — you carried too much speed into the corner, the truck rotated too slowly, and you drifted off the outside edge. Braking a fraction earlier and turning in tighter keeps you inside the boundary and, because you never lose the speed cap, produces a better lap.

3. Use the full width, deliberately

Track tiles are 360 units across with the drivable corridor filling most of that, so there is real width to work with. Placing the truck on the outside of the corridor before a corner and unwinding to the inside gives you a straighter, faster path — and because the boundary is exact, you can commit to using every pixel of it.

About the different surfaces

You will see references to asphalt, mud, sand and gravel around the project, and the track generator carries a full property table for them — grip coefficients, speed multipliers, colours. It is worth being straight about the current state of that system.

We would rather tell you that than publish a physics table you cannot feel in the car. If you have been trying to work out why the mud sections do not seem to slow you down, now you know: they are not mud yet.

Reading the daily track before you drive it

The front page publishes the day’s specs — checkpoint count, total distance and the surface distribution — before you enter the lobby. Because the layout is identical for everyone and fixed for the whole day, a minute spent looking at the shape of the circuit is a minute well spent. The track generation guide explains how the layout is built, which will tell you what shapes to expect.

Next, the part that turns a clean lap into a fast one: when to spend your three nitro canisters.