| 摘要 |
<p>A road stud comprises a body (2) made from a transparent material. A recess (12) in the body accommodates a reflective device (14). Light (20) travelling horizontally is refracted at a light-receiving surface (10) on the body to fall on the reflective device (14) substantially normally. The light is thus reflected back to return in the direction towards the source.</p> |
