Rally drivers need co-drivers because they race on roads they can’t memorize, at speeds where their eyes alone aren’t enough. Unlike circuit racing, where drivers lap the same track dozens of times, rally stages stretch across miles of public roads, forest trails, and mountain passes that change with every event. A co-driver sits beside the driver and reads a constant stream of detailed instructions, telling them exactly what the road does next before they can see it. Without that voice in their ear, a rally driver would have to slow down dramatically or crash.
Why Vision Alone Isn’t Enough
Rally cars regularly travel over 100 mph on narrow, unpaved roads lined with trees, rocks, and ditches. At those speeds, a driver’s reaction time (under 200 milliseconds for elite competitors) is barely enough to process what’s directly in front of them. The road constantly throws obstacles that are physically invisible until it’s too late: blind crests where the road rises and drops away, tight corners hidden behind tree lines, sudden surface changes from gravel to mud. A circuit driver learns every meter of track through repetition. A rally driver gets one or two slow reconnaissance passes before racing a stage flat out.
That’s where the co-driver becomes the driver’s second set of eyes, except they’re looking at a notebook instead of the road. They’ve already recorded every corner, crest, and hazard during reconnaissance, and they read those notes back in real time so the driver knows what’s coming five, ten, or fifteen seconds ahead. The driver can commit fully to the corner they’re in because their co-driver has already told them what follows it.
How Pace Notes Work
Pace notes are a shorthand language the co-driver reads aloud throughout every competitive stage. Each note describes a corner’s tightness, the distance to the next feature, and any dangers along the way. Corner severity is typically rated on a numerical scale, often 1 through 6, where 1 is the tightest hairpin and 6 is a gentle, nearly flat curve. Some crews use scales of 1 to 5 or 1 to 10, but the principle is identical: lower numbers mean sharper turns that demand more braking.
Between corners, the co-driver calls out straight-line distances in meters. “Left 3, 100, right 5” means a moderately tight left turn, then 100 meters of straight road, then a wide right curve. These calls come rapid-fire, one after another, for stages that can last 20 minutes or more. The co-driver adjusts their timing so notes arrive just far enough ahead for the driver to prepare, not so early that they’re forgotten and not so late that they’re useless.
Hazard Warnings
Pace notes go well beyond corners. Co-drivers call out crests (where the road rises and drops, sometimes launching the car into the air), jumps (larger crests where the car will leave the ground entirely), bumps, water splashes, and surface changes. One of the most critical calls is “don’t cut,” which warns the driver that the inside of an upcoming corner has a wall, rock, tree, or ditch. Cutting that corner to save time would mean hitting something solid at speed. These hazard calls can be the difference between finishing a stage and ending up in a ditch.
Navigation and Timekeeping Between Stages
Racing isn’t the only job. Between competitive stages, rally crews must drive on public roads (called liaison sections) and arrive at time controls at a precise minute. This is entirely the co-driver’s responsibility, and the penalties for getting it wrong are harsh. Arriving late to a time control costs 10 seconds for every minute overdue. Arriving early is even worse: one full minute of penalty for every minute early.
To manage this, most co-drivers wear two watches. One tracks official rally time, and the other records stage times and intervals between sections. The car also has a trip meter that measures distance so the co-driver can cross-reference their position against the organizer’s road book, a document that maps every junction, fuel stop, and control point across a rally that may span hundreds of kilometers over several days. The co-driver calculates the exact moment to hand their time card to the marshals at each control. A simple arithmetic error can cost more time than a spin on a stage.
Talking Through the Noise
Rally cars are extraordinarily loud inside. The engine sits just ahead of or behind the crew, exhaust noise fills the cabin, gravel hammers the underside of the car, and impacts from rough terrain create constant vibration. Crews communicate through wired intercom systems built into their helmets, equipped with digital active noise cancellation that clears background noise in milliseconds. Both the driver and co-driver have individual volume controls, and the systems offer multiple levels of noise filtering so every call comes through clearly. Without this technology, the co-driver’s voice would be completely drowned out during a stage.
The Physical Toll on Co-Drivers
Sitting in the passenger seat of a rally car while staring at a notebook sounds passive, but it’s physically punishing. Co-drivers experience the same g-forces, impacts, and violent changes of direction as the driver, all while keeping their eyes locked on a page of handwritten notes rather than the road ahead. That combination of visual focus and physical motion is a recipe for motion sickness. Research on rally co-drivers found that motion sickness was reported in about 2.3% of competitive special stages. During reconnaissance, when the co-driver constantly shifts their gaze between the road and their notebook to write notes, the rate jumped to 15.3%. The main triggers were stress (reported by 63% of co-drivers), smells inside the car (46.5%), and cabin temperature (43%).
The physical demands go beyond nausea. Co-drivers must maintain perfect vocal clarity and timing while being thrown around the cockpit, reading tiny handwriting in a vibrating car, and staying mentally sharp across multiple stages in a single day. A momentary lapse, a skipped line, or a late call can send the car off the road.
Trust at 100 mph
The driver-co-driver relationship is built on absolute trust. When a co-driver calls “flat over crest,” the driver plants the throttle and launches over a blind rise without seeing what’s on the other side. They’re trusting that the notes are accurate and that the co-driver is reading the right line at the right time. If that trust breaks down, the driver starts second-guessing calls, lifting off the throttle “just in case,” and losing seconds on every stage.
This is why the best rally partnerships last for years or even entire careers. The driver learns the co-driver’s voice, rhythm, and emphasis. The co-driver learns exactly how far ahead to read, when to add urgency, and how the driver interprets certain calls. A new pairing typically needs several events just to develop a shared language and comfortable cadence. Swapping co-drivers mid-season can cost a championship contender significant time, not because the replacement is less skilled, but because the calibration between two people takes hundreds of kilometers to build.
Rally driving is, at its core, a two-person sport. The driver controls the car. The co-driver controls the information. Neither can win without the other.