U.S. Route 34 (US 34) is an east–west United States highway that runs for from north-central Colorado to the western suburbs of Chicago. Through Rocky Mountain National Park it is known as the Trail Ridge Road where it reaches elevation , making it the third highest paved through highway in the United States. The highway's western terminus is Granby, Colorado at US 40. Its eastern terminus is in Berwyn, Illinois at Illinois Route 43 and Historic US 66. U.S. Route 34 becomes a toll road for a short distance in Colorado, where it passes through Rocky Mountain National Park. Route description Colorado In the state of Colorado, U.S. Route 34 runs north from Granby through Rocky Mountain National Park. It passes through Estes Park, Loveland, and Greeley before entering Nebraska east of Wray. Within Rocky Mountain National Park US 34 is known as Trail Ridge Road. Due to its high elevation through the park and over the Continental Divide, Route 34 closes entirely in winter from the Colorado River Trailhead on the west (10 miles north of the Grand Lake entrance) to Many Parks Curve on the east (8 miles from the Estes Park entrance.) Closure runs roughly from mid-October to Memorial Day weekend in May, and can occur at any time in summer due to high alpine snow storms. Route 34 transverses Fall River Pass and Milner Pass in the Front Range of Colorado. Nebraska In the state of Nebraska, U.S. Route 34 is a major east–west arterial surface road along the southern portion of Nebraska. It enters Nebraska west of Haigler and overlaps other routes for the majority of its routing. U.S. 34 passes through Hastings, Grand Island, Seward, and Lincoln before entering Iowa between Plattsmouth and Bellevue. U.S. Route 34 from between Hastings and Grand Island is known as the Tom Osborne Expressway, which is named for the former Hastings resident, Nebraska Cornhuskers football coach, and Congressman. In Lincoln, U.S. 34 overlaps with Interstate 180 from its junction with Interstate 80 into downtown where it becomes North 9th/North 10th Streets, then east as "O" Street. Also, the segment from the Lancaster County/Cass County border to Nebraska Highway 1 south of Elmwood is the Bess Streeter Aldrich Memorial Highway, after the former author and Elmwood resident. Iowa In the state of Iowa, U.S. Route 34 is a major east–west arterial surface road across southern Iowa. It enters Iowa