Question juridique clé
Whether the turnstile was subject to a building permit.
Solution extraite
No. The turnstile was not building-permit subject because it merely supported an existing traffic restriction and did not prevent the proper use of the footpath.
Motifs extraits
Under the cantonal rules, traffic-calming and road-space measures within the road area need no permit if they do not conflict with a functional transformation under the land-use plan. Such ancillary measures are not meant to be reviewed in building-permit proceedings when they only enforce an existing signalization or restriction and leave the road's ordinary function intact.