Building a Freeway

Loop 303 and Greenway Intersection
Accommodating existing traffic is a key priority when ADOT builds a freeway … Depending on the project, that can mean working out a construction schedule that takes rush hours into account or hiring extra crews to flag and direct traffic through the site.
ADOT Heavy Machinery used to move dirt.
Before you can build a freeway, you’ve got to move a little dirt... Make that a LOT of dirt, especially in the case of the Loop 303 project under construction right now in the West Valley.
False Work used during bridge construction
Last month, as part of our Building a Freeway series, we told you about the massive underground support substructures that help give bridges strength. Next up in the series is an important -- but temporary -- structure that’s used as crews build a bridge, tunnel or even a box culvert.
Workers construct massive caissons
You know when you drive under or over a freeway bridge that it’s a massive structure… There are the two abutments (the upright supporting structures at each end that carries the load of the bridge span), there are usually center columns or piers, and, of course, the girders and the bridge deck (the part you actually drive across).
Prewetting the soil at a construction site
When ADOT has a freeway to build, many steps must be taken long before any asphalt is paved. One of those initial tasks involves pre-wetting the soil, which entails pretty much exactly what you think it does … crews put sprinkler systems into place and water the dirt!
Worker running construction equipment on Loop 303
When ADOT builds a road, the work gets started years (sometimes decades) ahead of any real construction … It all begins with the planning phase, which includes everything from determining where a new roadway is most needed to taking a look at available funding.


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