Choosing Between A Shuttle And A Cab Programme

• BTT Team
• 11 May 2026
• 3 min read

This decision is usually argued as a matter of preference. It is not. Three measurable properties of your site determine the answer, and they can be worked out in an afternoon.

Shuttles move groups along corridors on a timetable. Cabs move individuals between arbitrary points on demand. Each is efficient in the conditions the other handles badly, and the only real question is which conditions describe your site.

The Three Variables

1. Density

How many employees live close enough to one another to share a corridor? Plot home locations against your site. If a large share falls along a handful of routes, shuttles will fill. If they are scattered evenly across a wide area, no shuttle route reaches useful occupancy and you are paying to move empty seats.

2. Shift Spread

How tightly clustered are start and end times? Shuttles depend on many people wanting to travel at the same moment. A site with three clean shift boundaries suits them. A site where arrivals trickle across three hours does not — unless the timetable is consolidated first, which is often the cheaper intervention.

3. Geography

Can a large vehicle physically and legally serve the route? Narrow approaches, restricted turning, weight limits, parking and residential access rules can rule out a coach on a corridor that looks ideal on a map. This is worth checking on the ground before it is designed on paper.

A Quick Way To Decide

Score each corridor rather than the site as a whole. For every candidate corridor, ask:

• Would a single vehicle be at least two-thirds full at the busiest departure?
• Does one departure time serve most of that group without anyone waiting more than about half an hour?
• Can the vehicle actually reach every proposed stop, at that hour, legally and safely?

Three yeses means a shuttle. Two means a smaller vehicle on the same principle. One or none means cabs, or a rethink of the timetable before anything else.

The right answer is almost never one model everywhere. It is shuttles where the corridors are dense and cabs where they are not.

The Hybrid Most Organisations End Up With

In practice, mature programmes tend to converge on the same shape: shuttles carrying the bulk of the headcount on a small number of dense corridors, and a deliberately limited cab programme covering thin routes, unusual hours, late-running exceptions and staff whose circumstances need it.

The discipline is in keeping the cab programme genuinely limited. Because it is flexible, it absorbs every exception unless someone is watching — and the cost of an exception-driven cab programme is the single most common overspend in corporate transport.

Review It On A Schedule

Both density and shift spread change as an organisation hires, moves and reorganises. A corridor that justified a coach two years ago may now carry twelve people. Re-run the three questions once or twice a year against current data, and be prepared to retire routes as readily as you add them.