Are you allowed to park in the marked areas for disabled people, if the parking time does not exceed 15 minutes?

Parking in a place marked with sign D-18a with supplementary plate T-29 and horizontal marking P-24 (a so-called 'envelope') is permitted only for vehicles displaying a valid disabled person's parking card. The duration of the stop is irrelevant – even a one-minute stop by an unauthorised person is not allowed. Failure to comply with this prohibition is punishable by a hefty fine, penalty points, and the vehicle being towed at the owner's expense.