OKLAHOMA CITY - The executive director of the Oklahoma Turnpike Authority is resigning next month to take a similar position in Colorado.

Earlier this week, Tim Stewart announced his resignation effective January 31, 2016 to accept a post with E-470 Public Highway Authority in Denver. '

Stewart has worked for the OTA for 31 years and has been its executive director since  2013.

Neal McCaleb, a former Oklahoma Secretary of Transportation has named interim director of the OTA. 

The Associated Press contributed to this report.