What does it mean when it says “driver and guard” on the pennant?

It is an honorary title or award.

The Driver Champion is an honorary title or award that recognizes a driver or drivers who have excelled in the transportation industry. This title is given to drivers who demonstrate excellence in driving skills, safety awareness, service attitude, etc. Such an award will be presented to the commended driver or driver in the form of a pennant, with the words "Driver's Guard" engraved on it, as a symbol and commemoration.