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On freeways and highways, every one (or sometimes two) white stripes separating lanes is followed by a white shining cat's eye. On the edge of the road next to the median strip, a yellow cat's eye is placed every 10 metres (33 ft). On the road shoulders a red shining cat's eye is placed every 10 metres (33 ft).
Today, there are more than 25 million Botts' dots in use in California, [6] though they have started falling out of favor. In 2017, Caltrans announced that it would stop using Botts' dots as the sole indicator of lane division, due to cost and worker safety, and in order to make roadways more compatible with self-driving cars.
Cat's eye, invented by Percy Shaw in the 1930s, cat's eyes equip many major routes in the British Isles. They consist of four reflective lenses mounted in a durable white rubber housing, two facing fore and two facing aft. The housing is mounted within a cast iron shoe, which the rubber housing sinks in to when driven over.
When the Road Price Is Right – Land Use, Tolls, and Congestion Pricing, Urban Land Institute, 2013, ISBN 978-0-87420-262-5; TripSum @ Xeesa.com: Online Fuel/ ERP/ Taxi fare calculator to check and calculate Fuel cost, ERP(Toll pricing) and Taxi Fare needed for a motorist's driving or taxi trip in Singapore
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M9 motorway in Carlow, Ireland with cat's eyes on the road surface and retroreflectors on barriers. In almost all European countries, such markers will include reflective lenses of some kind. Most appear white or gray during daylight; the colors discussed here are the color of light they reflect.