The failure is always the same shape
Nobody loses a driver file. What happens is that a medical certificate expires on a Tuesday, nobody notices, and the driver runs airport transfers for three weeks before anyone checks.
The cost is rarely a single fine. It is the run you cancel at short notice, the corporate account that asks why, and the audit that now looks at everything else because it found one thing.
The reason this keeps happening is structural, not careless. Every document has a different renewal cycle, issued by a different authority, and the only thing tying them together is somebody remembering.
Why the spreadsheet stops working
A spreadsheet is fine for four drivers. It fails at twelve, and it fails in a specific way: it is accurate on the day someone updates it and decays from there.
It also has no opinion about time. A date in a cell does not become urgent as it approaches. A person has to look, and looking is the thing that stops happening in a busy week.
The fix is not a better spreadsheet. It is something that watches the dates and speaks up before they matter, which is a different kind of tool.
What a working system does
Holds every document per driver with its expiry date, so the file is one place rather than an inbox, a filing cabinet and somebody's phone.
Warns ahead of the date, not on it. A licence renewal needs weeks, not a same-day alert. The useful warning arrives while there is still time to act.
Exports the whole file on demand. When an auditor asks, the difference between a bad afternoon and a routine one is whether you can produce it in a minute.
This is what Driver Files HQ does, and it exists because our limo clients kept getting caught by exactly this. It was not a product idea; it was the same problem arriving four times.
Start here, even without software
List every document type you are responsible for, per driver. Most operators find one they had forgotten.
Put the expiry dates in one place, however crude, and sort by date. The next ninety days is usually more crowded than expected.
Decide who owns the chase. Compliance that is everybody's job is nobody's job, and that is true whether it is tracked in software or on paper.