Compulsory L-Turn Code
It is a square of 60 cm. each side, divided into two triangles one of which contains grooves inclined at 45° with respect to the grooves in the Straight Direction Code; the second triangle contains the spherical segments which indicate an area of danger or an area not to be used.The tile size is 30x30 cm.The Code is created by installation of four tiles having three different surface finishes (art. 30x30 round, art. 30x30 diagonal/round and art. 30x30 diagonal).
It consists of a square-shaped bubbled surface, of 60 cm each side, made with 9 tiles (art. 20x20 studs).
It consists of a strip of 40 cm depth, with a surface densely lined in a perpendicular direction with respect to the Straight Code grooving; the width in excess of the 60 cm of the straight route stands out in the direction of the service or the object adjacent to the route which is intended to be pointed out.The code is created by using tiles of 20x20 cm (art. 20x20 lines).
Dangerous to Pass Code
It consists of a combination of two codes, an Attention-Service Code strip of 20 cm (art. 20x20 lines) immediately followed by a Stop-Danger Code strip, also of 20 cm (alternated art. 20x20 12 round and 20x20 13 round); it is placed for protection in an area which must be tackled with great caution (a pedestrian crossing or stairs in descent)