Intelligent Transportation System

Traffic stopped at a Ramp Meter
2/5/2014

Ramp Meters: Unappreciated or just misunderstood?

Ramp meters help to control the flow of traffic entering a freeway.
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Intelligent Transportation System
Ramp Meters
Librarian Dale Steele oversees the collection at the ADOT Research Center Library.
10/25/2011

ADOT library is focused on transportation research

The ADOT Research Center Library might not carry any best-sellers, but where else are you going to find a title like, “Benefits of high volume fly ash: new concrete mixtures provide financial, environmental and performance gains”?
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ADOT Research Center
Intelligent Transportation System
Bridge in Northern Arizona
8/8/2011

Research Center guides ADOT toward transportation innovation

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.
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ADOT Research Center
Intelligent Transportation System
Environmental
Planning
Ramp Meters
Rubberized Asphalt
Safety
Ramp Meter on Freeway
6/23/2011

Getting the green light: Valley ramp meters now more efficient

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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Intelligent Transportation System
Lighting
Ramp Meters
Signals
Video
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