Rally racing is not just a test of driving skill, it is a test of communication, timing, and engineering judgment. On closed public or forest roads, drivers often cannot see the next corner, crest, or hazard until it is too late to react safely at racing speed. Pace notes solve this problem by turning the road ahead into a coded stream of information read aloud by the co-driver.
The system lets the driver commit to speed, braking, and line choice before the road is visible.
Understanding Rally Pace Notes and the Co-Driver
The co-driver must deliver each instruction early enough for the driver to use it, but not so early that the driver mixes it with the wrong corner. This is called note timing or note cadence. The correct lead changes with speed.
A fast car on a wide road needs calls much earlier than a slow car in a narrow hairpin section. The co-driver listens to engine speed, watches the route, and learns the rhythm of the stage. A pause, a rushed word, or an unclear number can change the driver’s decision.
Good calling is calm and even. The voice becomes part of the car’s control system.
Pace notes guide more than steering direction. They help the driver manage the limits of tyre grip. A car has only a limited amount of grip available at each tyre.
Heavy braking uses much of it. Turning uses it too. On loose gravel, mud, snow, or wet tarmac, this limit can change suddenly.
A warning about a tightening bend tells the driver not to carry too much speed from the earlier section. A crest matters because the wheels may become light as the car rises.
With less load on the tyres, steering and braking become less effective. The driver may need to straighten the car, reduce speed earlier, or choose a safer line before the crest.
Creating notes during reconnaissance is a careful engineering task. The crew must describe what the car will actually meet at competition speed, not just what looks dangerous from a slow road car. They check corner entry, exit visibility, surface changes, drainage bumps, trees close to the road, and places where the road narrows.
They decide which details need a special warning. Too few details leave the driver unprepared. Too many details overload attention and make the notes hard to hear.
Crews refine wording until each phrase has one clear meaning. They may update notes when weather changes the surface or when road crews leave loose gravel after repairs.
Students can connect this process to many everyday skills. A passenger giving directions has to speak before a junction, not while the driver is already turning. A football player calls for a pass before reaching open space.
In both cases, information has value only when it arrives at the right time. When learning pace notes, pay attention to sequence. Each instruction describes a chain of events, so the word into tells the driver that the next corner follows immediately.
Notice the difference between a warning that changes speed and one that changes road position. The strongest notes are short, consistent, and linked to the physical limits of the car. They reduce surprises, but they never remove the need for driver judgment.
Key Facts
- Pace notes describe the road ahead using distance, direction, corner severity, road shape, and hazards.
- A common corner scale uses 1 for very slow or tight turns and 6 for fast or nearly flat turns, but teams may use different systems.
- Example sequence: 100, R5 over crest, 50, L3 tightens, don't cut, into hairpin right.
- Stopping distance depends strongly on speed: d = v^2 / (2μg) for ideal braking on level ground.
- Reaction distance is d = vt, so a 0.5 s delay at 30 m/s adds 15 m before any braking begins.
- During recce, the driver and co-driver travel the stage at controlled speed to create, check, and refine the pace notes before competition.
Vocabulary
- Pace notes
- Pace notes are a coded written description of a rally stage that tells the driver what is coming next.
- Co-driver
- The co-driver is the navigator who reads pace notes at the correct time and helps manage timing, route, and stage information.
- Recce
- Recce is the pre-event reconnaissance drive where the crew studies the stage and creates or checks their pace notes.
- Crest
- A crest is a rise in the road that can hide the road beyond it or reduce tire contact if the car becomes light.
- Don't cut
- Don't cut means the driver should avoid placing wheels inside the corner because of a hazard such as a rock, ditch, rut, or barrier.
Common Mistakes to Avoid
- Reading the notes too late is wrong because the driver needs time to brake, position the car, and set up for the next feature before it is visible.
- Treating every number system as universal is wrong because one team's 5 or 6 corner may not match another team's scale or driving style.
- Ignoring distance calls is wrong because the gap between features controls rhythm, speed choice, and whether the driver can fully accelerate.
- Thinking the co-driver only gives directions is wrong because pace notes also include grip changes, crests, jumps, hazards, surface changes, and warnings about line choice.
Practice Questions
- 1 A car is traveling at 27 m/s and the co-driver gives a braking call 2.0 s before the corner. How far does the car travel during that time before braking begins if the driver waits the full 2.0 s?
- 2 On gravel, assume μ = 0.60 and g = 9.8 m/s^2. Using d = v^2 / (2μg), estimate the ideal braking distance from 25 m/s to rest on level ground.
- 3 A pace note says 80, crest into L2 tightens, don't cut. Explain what information each part gives the driver and why trust between driver and co-driver is essential on a blind road.