The Three Stages

The handbook builds safe driving on observation — using sight and hearing to perceive what's around you. Extended into a full model, and used as this module's spine, safe driving is three stages in sequence:

Observe — take in the complete, current traffic picture: the road, the users on it, the situation developing. The handbook's driver visibility concept lives here — the maximum distance at which you can clearly identify what's around you, varying by vehicle, conditions, and your own ability.

Decide — interpret what you've observed and choose a response: adjust speed, change position, prepare to stop, hold back.

Act — execute the decision through the controls, and through your own reaction time. The Physics of Stopping already measured this stage in metres: the Act stage is where thinking becomes reaction distance.

Every crash runs through this chain — and each stage can only be as good as the one before it, which is why observation comes first.

The stages are sequential and dependent, and that's the whole insight: Act can only be as good as Decide, which can only be as good as Observe. A perfect emergency stop executed on a hazard you noticed too late is still a crash. Which is why this module front-loads observation — it's the stage everything downstream depends on.

Key takeaways

Safe driving runs Observe → Decide → Act: perceive the picture, choose the response, execute it through the controls and your reaction time
The stages are dependent — a flawless action on a too-late observation is still a crash, so observation is where everything starts

Quick check

A driver brakes perfectly but still hits a child who ran out, because they never saw the child until the last moment. Which stage failed?

A) Act — the braking must not have been hard enough

B) Observe — the action was sound but triggered too late, because the developing hazard wasn't perceived in time

C) Decide — they chose the wrong response

D) No stage failed; the child was at fault