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The minimum vertical clearance is 5.4 metres (17 ft 9 in) for main roads and highways, and 4.6 metres (15 ft 1 in) for other local roads with road authority approval. For high and very high clearance roads, the values are between 5.9 metres (19 ft 4 in) and 6.5 metres (21 ft 4 in).
Vertical clearance: The minimum vertical clearance under overhead structures, such as bridges, is 16 feet (4.9 m), including both paved shoulders and an allowance for extra layers of pavement. Through urban areas, at least one routing is to have 16-foot (4.9 m) clearances, but others may have a lesser clearance of 14 feet (4.3 m).
CR-A003 (Columbus-Santa Teresa Highway) is the only county road in New Mexico to exceed the statutory maximum 55 mph speed limit for county roads. Interstate 10 was 70 mph between the Texas-New Mexico state line and two miles south of I-25 in Las Cruces until October 2012, when it was raised to 75 mph.
The highest speed limit for undivided roads is 75 mph (121 km/h) in Texas. Undivided road speed limits vary greatly by state. Texas is the only state with a 75 mph (121 km/h) speed limit on 2 lane undivided roads, while most states east of the Mississippi are limited to 55 mph (89 km/h).
A narrow road in the countryside. County highway, county road, or county route A road in the United States and in the Canadian province of Ontario that is designated and/or maintained by the county highway department. Couplet. See one-way pair. Crossbuck A traffic sign used to indicate a level railway crossing.
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This section of highway was for many years marked as US 3 and "To I-93", but these have now been replaced with regular I-93 signs. The Federal Highway Act of 1973 exempts this 7.6-mile (12.2 km) stretch from the Interstate Highway standards that apply elsewhere, and this highway is considered to be I-93 for all practical purposes. [19]
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