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Travelers can dial 511, a three-digit telephone number, on landlines and most mobile phones. The number has also extended to be the default name of many state and provincial transportation department road conditions Web sites, such as Wisconsin's site. [1] It is an example of an N11 code, part of the North American Numbering Plan.
The county-designated highways in Michigan comprise a 1,241.6-mile-long (1,998.2 km) system of primary county roads across the US state of Michigan. Unlike the State Trunkline Highway System , these highways have alphanumeric designations with letters that correspond to one of eight lettered zones in the state.
This traffic light using red-yellow-green was developed by William Potts, a Detroit police officer. [10] Michigan is also home to the first snowplow. [11] This winter maintenance started during World War I to keep 590 mi (950 km) of strategic highways clear. [10] In 1919 Michigan first signed the trunklines, the second state after Wisconsin to ...
The tower elevated a police officer above the center of the intersection to direct traffic before it was replaced in October 1920 with the world's first four-way traffic light. [65] While Michigan was the second state to post route designations along its highway system in 1919, [62] Michigan actually began assigning internal trunkline ...
MDOT is the agency responsible for the day-to-day maintenance and operations of the State Trunkline Highway System, which includes the U.S. Highways in Michigan.The numbering for these highways is coordinated through AASHTO, [6] an organization composed of the various state departments of transportation in the United States. [7]
Most of the following connectors are unsigned, [232] but they were inventoried publicly as part of the 6th edition of the Michigan Geographic Framework in 2006. [233] Up through the 7th edition, MDOT used a different numbering system, [234] which was changed in May 2008 with the publication of the 8th edition. [235]
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Traffic connecting between M-21 and I-475 must use the frontage roads to make the connection. [ 3 ] [ 4 ] All of M-21, except for some segments just outside Grand Rapids and Flint, along with the highway split into two one-way streets inside Flint, is undivided surface road; none of M-21 is freeway . [ 3 ]