Informational signs
Informational signs are mainly rectangular (square or oblong) but, strictly speaking, this category also covers directional signs. They are often coloured to match the directional signing for the status of road in question, but where this is not necessary they are generally blue with white text. Examples include "lane gain" and "lane drop" signs on grade-separated roads, and "IN" and "OUT" indications for accesses to private premises from the highway.
Regulatory signs
Signs in circular red borders are prohibitive, whether or not they also have a diagonal red line. Circular blue signs mainly give a positive (mandatory) instruction. Such circular signs may be accompanied by, or place on, a rectangular plate (information) that provides details of the prohibition or instruction; for example, waiting and loading plates and zone entry signs.
"Stop" signs (octagonal) and "Give Way" signs (inverted triangle) are the two notable exceptions, the distinctive shapes being recognisable even if the face is obscured by dirt or snow.
Warning signs
The importance of a warning sign is emphasised by the red border drawn around it and the triangular shape.
Colour
Three colour combinations are used on Worboys direction signs depending upon the category of the route. A road may be a motorway (white on blue), a primary route (white on dark green with yellow route numbers), or a non-primary route (black on white).| Background | Border | Lettering | Usage | Ruleset |
| White | Black | Black | Non-primary Route | Worboys |
| White | Red | Black | Ministry of Defence sites | |
| Yellow | Black | Black | Roadworks | Guildford |
| Green | White | White with Yellow Route Numbers | Primary Route | Worboys |
| Blue | White | White | Motorway | Anderson |
| Brown | White | White | Attractions |
The blue circular signs are giving and instruction and the red signs are telling of a danger. So using either of these two colours within my design would work, as i am giving an instruction about ways to drive efficient and its telling you how to improve fuel consumption which is a danger.
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