<P> School zones through urban and suburban areas on two lane roadways normally have a speed limit of 25 mph when children are present . However, this limit can be as low as 20 mph and as high as 35 mph in some areas . </P> <P> With the exception of wartime, New Mexico had no default numeric speed limit until the early 1950s . Prior to the national 55 mph limit in 1974, the speed limit on rural Interstates was 75 miles per hour during the day and 70 mph at night . Primary highways in open areas had daytime speed limits of 70 mph and nighttime ones of 60 mph . Secondary highways in open areas had daytime speed limits of 60 mph and nighttime ones of 50 mph . Before the end of federal speed controls, the maximum speed limit was 65 mph on Interstate routes and 55 mph elsewhere . In May 1996 legislation enacted by Governor Gary Johnson raised the absolute speed limit in New Mexico to 75 mph . Signs are posted on the vast majority of the mileage of Interstate routes to that effect . The default speed limit for any road where no speed limit is posted is 55 mph . </P> <P> New Mexico has six major freeway facilities, which include three lengthy Interstate routes . Part of US - 70 (as a divided highway) between Las Cruces and Alamogordo is the only section of non-Interstate route as well as being the only road in New Mexico that's not a freeway to have the 75 mph limit; New Mexico, Nevada (US 95 south of US 93), and Texas are the only three states with 75 mph limits on roads that aren't freeways . There is no statutory requirement for reduced speeds on urban freeways so that, for example at Santa Fe and Las Vegas the speed limit remains 75 mph on I - 25 . New Mexico, Kansas, North Dakota, Colorado, and Texas are the only states to have a speed limit greater than 70 mph in urban highways . Nonetheless, there are 65 mph limits on freeways in more heavily urbanized areas such as Albuquerque and Las Cruces . Other reduced speed limits do exist, but the lowest speed limit under normal conditions on New Mexico's freeways is 55 mph, which can be found on two sections of Interstate 25: The first section being three miles from the Big I to Gibson Boulevard in Albuquerque, and the second being a short stretch near Raton Pass . These particular stretches of I - 25 were originally built as relocations of US - 85, whose design and construction predate the interstate highway era . As such, these stretches do not meet modern interstate highway standards, and have closely spaced interchanges, sharp curves, and / or limited sight distances . </P> <P> By statute, other state maintained roads may have speed limits of up to 75 mph . Four - lane divided highways in open areas often have 65 mph limits, with some 70 mph limits, such as almost the entire length of US 550 from Bloomfield to Bernalillo . There is a trend toward posting a 70 mph limit on these highways, such as the recent 70 mph speed limit posting (increased from 65 mph) on a 23 - mile stretch of U.S. 70 west of Roswell . </P>

Is there a speed limit on route 66