2. Compliance with the limit values and target values directed at the protection of human health …

(a)

any locations situated within areas where members of the public do not have access and there is no fixed habitation;

(b)

in accordance with Article 4, point (1), on factory premises or at industrial sites to which all relevant provisions concerning health and safety at work apply;

(c)

on the carriageway of roads; and on the central reservations of roads except where there is normally pedestrian or cycling access to the central reservation.