States can opt-out from DST, but such an exemption must apply to the entire portion of that State that lies in a given time zone (some states, like North Dakota, straddle two different zones). Currently, DST begins the second Sunday in March and ends the first Sunday in November. Congress has amended time change laws several times since then. The Standard Time Act of 1918, “an Act to save daylight and to provide standard time for the United States,” authorized the nation’s first “Daylight Saving Time” to begin on the last Sunday of March and conclude on the last Sunday of October. time zones as recorded in the National Transportation Atlas Database Daylight Saving Time rules begin in 1918 but have changed through the years Department of Transportation to change their time zone.Ĭurrent U.S. The early maps had today’s four time zones for the coterminous states, but the boundaries were very different from today. Time zone map of the United States from 1913, as published in the Chicago Daily News Almanac and Yearbook. British railroads were the first to adopt standard time in 1840, and railroads in the US and Canada adopted standard time zones in 1883. Thank the railroads for our standard time zonesīefore time zones were created, each locality set its own clocks to noon at the time of day when the sun was at its highest position. Virgin Islands) don’t practice the spring and autumn time change. territories (American Samoa, Guam, Northern Mariana Islands, Puerto Rico, and the U.S. Some states (Hawaii, Arizona-except for the Navajo Nation within the state) and U.S. Last weekend, millions of Americans turned back their clocks one hour to mark the return from Daylight Saving Time to Standard Time.

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.Freight Logistics Optimization Works (FLOW).Electric Vehicle Inventory and Use Survey (eVIUS).

Statistical Products and Data Main - Statistical 1.

Transportation Maps and Geospatial Data.

Introduction to Transportation Statistics.

United states time zones map