Gritter driver shortage?

Sixties boy:
Also gritting falls under “emergency” procedures, so you can ignore EU and domestic hours regs.

I did wonder about that.
“Exemptions
You do not need to follow the GB domestic rules if you:
are dealing with an emergency - for example, a major disruption to public services or danger to life”
gov.uk/drivers-hours/gb-domestic-rules

Is all gritting an emergency?
Or, in some circumstances, could be?