What Actually Predicts a Collision

The premise of driver behaviour monitoring is that the measured events predict collisions. The relationship is real, weaker than the marketing implies, and not the strongest one available.

What the evidence broadly supports

Speeding relative to limits and conditions is associated with both collision likelihood and severity. This is the best-supported link.

Harsh events correlate with risk, though the association is modest and is confounded by exposure type.

Distraction and fatigue are strongly associated with collisions and are measured by very few of these systems.

Previous collision history predicts future collisions better than most telematics measures, and requires no hardware.

What dominates and is not behavioural

Exposure. The single largest predictor is how much someone drives and in what conditions.

Route type. Urban multi-drop has a higher collision rate than motorway work, per mile, for everyone.

Vehicle. Size, visibility, safety systems, condition.

Time of day and fatigue state.

A programme addressing only behaviour is addressing a minority of the variance, which is worth knowing before the business case is written.

Why this matters for a scoring programme

A score that ignores exposure and route is mostly measuring exposure and route.

Which means the drivers at the top and bottom are largely determined by allocation.

And the intervention — coaching the bottom — is applied to a group selected by their rounds.

The interventions with stronger evidence

Reducing exposure: fewer miles, better routing, consolidating drops.

Schedule design: fatigue, shift length, start times.

Vehicle safety systems, which act at the moment of the event rather than weeks later.

Speed management, which is both measurable and directly linked.

Behaviour coaching sits below these in most analyses, which does not make it worthless — it makes it one part of a programme rather than the programme.

Stating this honestly internally

A business case claiming a collision reduction from scoring alone will not hold up, and when it does not, the whole programme loses credibility.

Claim what the evidence supports: identification of outliers, a channel for coaching, and evidence after an incident.

And put the exposure and schedule work alongside it, which is where the larger share of the reduction actually comes from.

Put the structural work alongside

Because the behaviour programme cannot carry the case alone.

Vehicle specification, schedule realism, fatigue in the rota, route design.

These contribute more to collision risk than anything a score measures, and they are within the organisation's control.

A programme presented as the whole answer fails visibly; one presented as part of a set survives its own limits.

Connect policy and data

The choices in this note can be compared with see how the platform works. Keep the written purpose in control and enable only the information needed at this boundary.

Independent reference

For a thematic point of reference, see the National Safety Council. Consult the source directly because technical, operational and legal details change.