Cannabis companies are the leading sponsors of Colorado highways, accounting for cleanup on two-thirds of the roads maintained by Clean Colorado — a program the industry has leveraged as a loophole in the state’s strict limits on marijuana advertising.

Currently, 51 cannabis dispensaries, cultivators, manufacturers and edible producers sponsor roadways throughout the state, according to data from the Adopt a Highway Maintenance Corporation.

Though they represent less than half of all organizations that participate in the Clean Colorado program, those cannabis firms’ reach spans about 198 miles, or 66% of the roads actively sponsored.

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