A street lamp comprising a lamp post (1) and at least one accessory support member (10) supporting at least one accessory (20), said post (1) being cylindrical, at least one accessory support member (10) having manual adjustment means (30) enabling the position of said at least one accessory support member (10) on said post (1) to be adjusted manually, said adjustment means (20) enabling the height and/or the position of said at least one accessory support member (10) to be adjusted in elevation and/or in azimuth relative to said post (1).