12/22/2023 0 Comments Time zones of america![]() 1 However, the need for coordination among all modes, became increasingly important after World War II. 1,5 That year, five time zones were officially adopted as the US entered World War I: the Eastern, Central, Mountain, Pacific, and Alaskan zones still in use today. 5 The federal organization in charge of railroad regulation – the Interstate Commerce Commission – was given the power to address coordination concerns in 1918. ![]() Standard time was transportation-driven and, as a result, the government coordination of time zones was handled by transportation agencies. 3 The major railroad companies as a result began to operate on a coordinated system of four time zones starting in 1883. 2 Due to this lack of time standardization, schedules on the same tracks often could not be coordinated, resulting in collisions. 2 With the proliferation of railroads, faster travel became possible across many cities and travelers could sometimes arrive at an earlier local time than the one they had left. 3 The resulting small time differences between adjacent towns and cities were not critical when it took days to travel from place to place. But that has not always been the case.īefore the establishment of time zones in 1883, there were over 144 local times in North America. 1,10 These time zones, with boundaries that have for the most part been fixed for more than a century, are taken for granted by most Americans. and the five additional time zones used in Alaska, Hawaii and other U.S. With the 2019 Fall release of the National Transportation Atlas Database (NTAD), a new map of the nation’s time zones is featured, showing the geographical boundaries of four time zones in the continental U.S. Advisory Council on Transportation Statistics.National Transportation Knowledge Network.National Transportation Library Main - Library.Vehicle Inventory and Use Survey (VIUS).Transportation Statistics Annual Reports.Local Area Transportation Characteristics (LATCH dataset).Government Transportation Financial Statistics.Statistical Products and Data Main - Statistical 1.Transportation Maps and Geospatial Data.Introduction to Transportation Statistics.Census Bureau’s annual estimates of the resident population for the United States, regions, states, and Puerto Rico: Apto July 1, 2019. Population totals for states are from the U.S. For this story, we also included time zones in Arizona where Navajo Indian Reservation observes Daylight Saving Time and Arizona does not. Time zones in the United States are defined in the U.S. To find the states with more than one time zone, 24/7 Tempo reviewed data from the Department of Transportation (DOT), which is responsible for overseeing time zones in the United States. These are the fastest growing and shrinking states. Even though the nation’s population has been shifting west and south, the localities generally attempt to move to the time zone to the east, mostly for economic advantages. Among the factors the DOT weighs are where people shop, work, and go to school, and the location of transportation centers. Communities have to prove a time zone change would bring an economic benefit. The DOT receives several requests each year for changes. The DOT has been responsible for overseeing time zones since 1967. Until standardization, each town had its own time. Standardization of time zones was advocated by railroads to improve their scheduling and make their operations safer. Congress made the system official with the Uniform Time Act of 1918. 18, 1883, and oversight of the zones was given to the Interstate Commerce Commission (ICC). The United States was divided into four standard time zones on Nov. We reviewed data from the Department of Transportation, the Federal Register, and reviewed articles from sources such as, , and to compile our list.Ĭlick here to see places with more than one time zone. Here is how your state was founded.Ģ4/7 Tempo has taken a look at the sometimes crazy-quilt nature of the time zone boundaries of the United States to understand how the time zones were determined. The rollout of the time zones is a mirror of how the nation has grown. Over the years, the Department of Transportation has split 15 states: Five were split by Mountain and Central time zones five were divided by Central and Eastern time zones two were sliced by Pacific and Mountain time zones and Alaska was cut into Hawaii-Aleutian and Alaska time zones. ![]() Sometimes a state fits neatly into one time zone, but not always. These time zone boundaries are determined by the U.S. The United States, the third-largest nation in the world by land and water, is divided into six time zones: Hawaii-Aleutian Time, Alaska Time, Pacific Time, Mountain Time, Central Time, and Eastern Time.
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