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... 1 S U M M A R Y Prioritization Procedure for Proposed Road–Rail Grade Separation Projects Along Specific Rail Corridors The multimodal surface transportation network of the United States, consisting of more than 4 million miles of public roadways and more than 138,000 miles of railways, intersects at grade more than 200,000 times. In 2015, there were 129,582 public highway–rail grade crossings and 80,073 private grade crossings [Bureau of Transportation Statistics (BTS)

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