Far-UV region

Cheap UV lights usually are usually 405nm or 395nm and are fairly blue, while 365nm is firmly UV-A. There's still some visible light, but not ...

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Phoenix-area drivers are used to seeing freeway entrance-ramp meters with alternating green and red traffic lights during weekday rush hours. But some of the red lights in Interstate 17 ramp meters also play a role as part of the pilot wrong-way vehicle detection system being tested by the Arizona Department of Transportation.

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Polycarbonate diffusers can create more uniform and gentle lighting than acrylic diffusers, but they also cost more.

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PHOENIX – Starting this week, the timing of ramp-meter signals along southbound State Route 51 (Piestewa Freeway) are being adjusted to respond to the flow of morning rush-hour traffic, expanding an Arizona Department of Transportation program that began last fall along the freeway’s northbound on-ramps.

Near UVand farUVrange

PHOENIX – With a goal of improving the rush-hour traffic flow, the Arizona Department of Transportation will test changes in the timing of ramp-meter signals along one Phoenix-area freeway.

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PHOENIX – One of the benefits of the recent widening of Loop 101 in the Scottsdale area is that on-ramp meters, featuring those alternating green and red traffic signals, won’t be in use as often now.

Starting the week of Oct. 3, afternoon rush-hour drivers using on-ramps along northbound State Route 51 (Piestewa Freeway) are likely to notice longer red lights at ramp meters as ADOT takes a look at how the signal adjustments affect freeway traffic.

Much has changed since ADOT got its start in 1927. Back then, the agency was known as the Arizona State Highway Department and roads certainly were built a little differently. Methods, materials and technology have changed so much since then.

If you drive Valley freeways during rush hour, you’re probably pretty familiar with ramp meters … They’re the two-light signals positioned at most Valley on-ramps that tell motorists when it’s okay to head onto the freeway. Ramp meters have been used in the Phoenix-Metro area for about the past 20 years and maybe you think not much about them has changed … but, actually they’ve recently become much more efficient!

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Only in a few narrow wavelength ranges, can infrared light make it through (at least partially) to a ground based infrared telescope. The Earth's atmosphere ...