Getting both tunnels built, however, would turn out to be an odyssey of nearly insurmountable engineering and mining challenges that busted budgets by tens of millions of dollars and stretched project timelines. Eisenhower/Johnson Memorial Tunnel, Colorado . Chain Laws: Click here to view chain laws. The following requirements apply to most routes (Green Routes); some smaller routes may require more: Note: All pilot car vehicles must be over 60 wide for CO. MISCELLANEOUS: Dozer blade can be detached and hauled with the dozer on same trailer if the load would be overweight with or without the blade. the fellow said we had tripped the 'height detector' coming up the grade. This new method of metering traffic is similar to the traffic signals located at on-ramps that regulate the flow of traffic entering the highways and Interstates in the Denver metro area. Actual construction of the 1.7-mile tunnel MP 73 to MP 77.5 (Savage Ave to Park St) 12' width -both directions-Width Restriction: No loads over 12 feet wide; twenty-four hours a day, 7 days a week until July 2022. [2] The Eisenhower tunnel is noted as the longest mountain tunnel and highest point on the Interstate Highway System. US-6, southeast of Eisenhower/Johnson Tunnel, US-6, southeast of Eisenhower/Johnson Tunnel,