After nearly 15 years of planning, hundreds of public comments, and a handful of lawsuits, a page turned Friday morning for a 10-mile stretch of Interstate 70 in north Denver.A slate of prominent transportation officials and politicians, including Gov. John Hickenlooper, formally broke ground on the $1.2 billion "Central 70" Project that will remake that section of freeway that officials call the lifeblood of the quickly growing Denver metro area."Without infrastructure, you can't grow. That's just a fact of life," Hickenlooper said after the event. "It's really building the foundation for the next 50 years of economic development for Colorado."Critics...