<P> In the United States , Canada , and Australia , these plastic devices commonly have two angled edges facing drivers and containing one or more corner reflector strips . In areas where snowplowing is frequent , conventional markers are placed in a shallow groove cut in the pavement , or specially designed markers are used which include a protective metal casting that is embedded in recesses in the pavement , allowing the marker to protrude slightly above the pavement surface for increased visibility , much like a cat 's eye . </P>
<P> In the United States , Canada , and Australia , these plastic devices commonly have two angled edges facing drivers and containing one or more corner reflector strips . In areas where snowplowing is frequent , conventional markers are placed in a shallow groove cut in the pavement , or specially designed markers are used which include a protective metal casting that is embedded in recesses in the pavement , allowing the marker to protrude slightly above the pavement surface for increased visibility , much like a cat 's eye . </P>
raised line markers on the roadway and shoulder are used to define
raised line markers on the roadway and shoulder are used to define
for increased visibility
for increased visibility