The best time to read a sign is long before the turn. Because the inspection interval follows your vehicle's age, knowing your date early keeps the whole route calm and clear.
A practical first move is to find the date on your most recent inspection report, which always states when the next one falls due; for a newly imported or newly bought car, the registration papers place it in the cycle.
Building a week or two of margin into that date is the single most useful habit a driver can form, turning a small fault into a quick repair rather than a failed test and a wasted morning.
When in doubt, assume the test is due sooner rather than later. Checking costs nothing, and a lapsed inspection costs a great deal more than an early one.