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Longer bridges can reduce the width of both shoulders to 4 feet (1.2 m). Existing bridges can remain part of the Interstate system if they have at least 12-foot-wide (3.7 m) lanes with 3.5-foot (1.1 m) shoulder on the left and a 10-foot (3.0 m) shoulder on the right, except that longer bridges can have 3.5 feet (1.1 m) shoulders on both sides.
The passing lane is commonly referred to as the fast lane, and the lane closest to the shoulder the slow lane. Some jurisdictions, particularly on limited-access roads, ban passing-lane driving while not overtaking another vehicle; others merely require slower cars to yield to quicker traffic by shifting to slower lanes, or have no limitations.
The sharpest curves tend to be on the narrowest of narrow gauge railways, where almost all the equipment is proportionately smaller. [4] But standard gauge can also have tight curves, if rolling stocks are built for it, which however removes the standardisation benefit of standard gauge. Tramways can have below 100-foot (30 m) curve radius.
The most infamous is called "Big Moody Curve". This curve is named after Big Moody Creek below, slightly greater than a 180 degree turn, and bracketed by additional 90 degree turns. The inside surfaces of the median barriers in both of these turns are normally chipped up and black with tire rubber. [citation needed]
Lane – The ordinal number of the lane with the first lane being on the inside; Total length – The total length of the lane; Radius – The radius of the curve 0.30m (for lane 1) and 0.20m (for lane 2 to lane 8) from the inner side into that lane; Semi-circle length – The length of the half circle of track at that radius
Sag vertical curves are those that have a tangent slope at the end of the curve that is higher than that of the beginning of the curve. When driving on a road, a sag curve would appear as a valley, with the vehicle first going downhill before reaching the bottom of the curve and continuing uphill or level.
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State Route 1 (SR 1) is a major north–south state highway that runs along most of the Pacific coastline of the U.S. state of California. At 656 miles (1,056 km), it is the longest state route in California, and the second-longest in the US after Montana Highway 200 .