Gatso Meter Speed Camera, Victoria Avenue, Cambridge, UK.

The yellow front surface is shows a spotted pattern from the high reflectivity glass beads (possibly 3M reflective sheeting).

Originally from the UK Speed Cameras web site:

"There are over 4,000 fixed Gatso's speed cameras currently in use by police forces and local authorities across the UK, accounting for 90% of all fixed cameras. The Gatso, which uses radar technology, is used for fixed speed cameras, in-car mobile units, on tripods, and can even be used from moving vehicles.
Fixed Gatso speed cameras are rear-facing. This is so the cameras "flash" does not blind oncoming motorists. Unfortunately, this also means the cameras are not always viewable until the last second (as pictured above). Empty units are well known to flash at oncoming traffic. The cost of installing a Gatso camera is approximately £20,000, but can cost as much as £40,000 if located in a rural location, as the system requires a 240v power supply.
The fixed Gatso camera has the ability to take up to 400 pictures. Cameras that are located in busy areas or are particularly hidden, often only last a few hours before the film runs out, soon recouping the £20,000-£40,000 price tag.
Gatso's can also identify between cars/vans and HGV's separately. For example, if the speed limit was 60 mph for cars/vans and 40 mph for HGV's the camera will enforce the two separate limits."

Keywords: Gatso, Speed camera, reflective sheet

Photograph © Andrew Dunn, 26 June 2005.

Website: http://www.andrewdunnphoto.com/

我，本作品的著作權持有者，決定用以下授權條款發佈本作品： 此檔案採用共享創意 姓名標示-相同方式分享 2.0 通用版授權條款。 您可以自由： 分享 – 複製、發佈和傳播本作品 重新修改 – 創作演繹作品 惟需遵照下列條件： 姓名標示 – 您必須指名出正確的製作者，和提供授權條款的連結，以及表示是否有對內容上做出變更。您可以用任何合理的方式來行動，但不得以任何方式表明授權條款是對您許可或是由您所使用。 相同方式分享 – 如果您利用本素材進行再混合、轉換或創作，您必須基於如同原先的相同或兼容的條款，來分布您的貢獻成品。 https://creativecommons.org/licenses/by-sa/2.0CC BY-SA 2.0 Creative Commons Attribution-Share Alike 2.0 truetrue