3. One of the following legends may be displayed on a variable message sign which is activated by a particular type of vehicle approaching the equipment which controls the sign—
(a)“OVERHEIGHT VEHICLE DIVERT” with—
(i)an arrow;
(ii)“USE” and a route number; or
(iii)“FOLLOW” and a symbol provided for at item 13 of the table in Part 11 of Schedule 12;
(b)“OVERHEIGHT VEHICLE TURN BACK”;
(c)“HIGH VEHICLE USE MIDDLE OF ROAD”; or
(d)“ONCOMING VEHICLE IN MIDDLE OF ROAD”.