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PAG’s intermodal rail planning focuses on the interface of the railroad network with the roadway network and impacts on all surface transportation modes.
Railroad crossings affect multiple roadways throughout the region. The combined Average Daily Traffic (ADT) of all roadways affected by at-grade railroad crossings totals approximately 966,000 vehicles per day. Over 1.8 million times each day, a person in the PAG region comes in direct contact with an at-grade crossing.
Twenty five of the region’s railroad crossings are grade separated, meaning that vehicles drive under a tunnel or over a bridge separated from the railroad line. While the ultimate solution to safety and congestion problems associated with at-grade rail crossings is to grade separate, this is extremely costly (at roughly $50 million or more apiece) and ultimately not warranted at all rail/roadway interfaces.
A map of major, public owned at-grade railroad crossings in the region is available on this page. The map does not include grade separated crossings or minor crossings in the region. 
As part of its general rail planning work, Pima Association of Governments (PAG) recently completed a project to explore and evaluate various types of controls and applications that can be implemented at highway-rail at-grade crossings to further improve the safety of such crossings.
The project served to update the rail grade crossing inventory for the region in addition to identifying local, national and international state of the practice highway-rail at-grade crossing strategies along with performing a “before” and “after” evaluation (1MB PDF) of a “pre-signal” control that was installed on Prince Road located just east of the I-10 Traffic Interchange.
The study provides a toolbox of strategies (2MB PDF) and a relevant local evaluation to assist local agency users and others in developing useful applications for highway-rail crossings in the PAG region. 



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