The Federal Highway Administration (FHWA) is a division of the United States Department of Transportation that specializes in highway transportation. The agency's major activities are grouped into two programs, the Federal-aid Highway Program and the Federal Lands Highway Program. Its role had previously been performed by the Office of Road Inquiry, Office of Public Roads and the Bureau of Public Roads.
Interstate 840 (I-840) is a 21.9-mile (35.2 km) auxiliary Interstate Highway and state highway in the U.S. state of North Carolina. It is the northern half of the Greensboro Urban Loop beltway around the city of Greensboro. It connects I-40, I-73, and US 421 in the west with I-40, I-85, and I-785 in the east. It was completed on January 23, 2023.
Interstate 270 (I-270) is a seven-mile-long (11 km) auxiliary Interstate Highway located in the northeastern part of the Denver metropolitan area in the US state of Colorado. It overlaps U.S. Highway 36 (US 36) for its entire length and is also a part of the Dwight D. Eisenhower Highway, which spans from I-270 and the Capital Beltway in Bethesda, Maryland, to I-80/US 101 in San Francisco, California. The western terminus of I-270 is at the interchange with I-25 and US 36. It heads eastward to an interchange with I-76, where the mileposts reset because of a previous freeway extension. The freeway heads southeast and comes to meet Vasquez Boulevard, where it enters Commerce City. The road crosses Quebec Street before ending at I-70.
Kentucky Route 212 is a short state highway located in Boone County, in the northern region of the U.S. state of Kentucky. The highway is approximately 1.3 miles (2.1 km) long, and partially constructed as a freeway, with the rest being a divided highway. The roadway links Interstate 275 (I-275) to the Cincinnati/Northern Kentucky International Airport, and has been designated as a connector route by the Federal Highway Administration (FHWA). A road first appeared near the location of KY 212 around 1937. A short road was built in the location of KY 212 when the U.S. Army Air Corps built the predecessor to the CVG Airport. The road was reconstructed to a divided highway in 1972, but was part of KY 1334 until 1974 or later, when KY 212 was designated, and KY 1334 was rerouted via Loomis Road and Whitson Drive to end at KY 20.
State Route 906 (SR 906) is a 2.65-mile-long (4.26 km) state highway in the U.S. state of Washington, serving Snoqualmie Pass and its associated ski areas in King and Kittitas counties. The highway travels southeast between two interchanges with Interstate 90 (I-90) in Snoqualmie Pass and Hyak. SR 906 was formed out of segments of the former Sunset Highway that were bypassed by the construction of the controlled-access Interstate Highway over the pass. Between 360 and 2,100 vehicles use the road on an average day in 2012.
State Route 223 (SR 223) is a 3.81-mile (6.13 km) long state highway located entirely in Yakima County, Washington, United States. It has served the role of connecting the city of Granger to the county seat, Yakima via Interstate 82 and to SR 22 since its establishment in 1967, serving between 4,000 and 8,500 cars per day on average in 2009.
Highway 261 is a designation for two state highways in Arkansas. Both are short rural highways in the Arkansas Delta. Created in 1957, the longer segment connects several small communities to Interstate 40 (I-40). The shorter route was created in 1973 between a Horton and Highway 1 in Caldwell. Both segments are maintained by the Arkansas Department of Transportation (ARDOT).
Highway 28 is designation for three east–west state highways in Western Arkansas. Two segments together running from the Oklahoma state line to Ola have been established since the original 1926 Arkansas state highway numbering, with the third segment designated in 1963. All three highways are rural, two-lane roads with relatively low traffic serving a sparsely populated and forested part of Arkansas. The highways are maintained by the Arkansas Department of Transportation (ARDOT).
Highway 206 is a designation for three east–west state highways in the Ozark Mountains. Each segment was created during periods of state highway systemwide expansions ordered by the Arkansas General Assembly to add system mileage in every county, first in 1957, and again in 1973. All are low-traffic highways providing connectivity between rural communities and major highways in the area. All are maintained by the Arkansas Department of Transportation (ArDOT).
Highway 396 is a former state highway near Burlington in Boone County. Between its designation as a state highway in 1973 and its decommissioning to the county road system in 2016, it was maintained by the Arkansas Department of Transportation (ArDOT).
A traffic count is a count of vehicular or pedestrian traffic, which is conducted along a particular road, path, or intersection. A traffic count is commonly undertaken either automatically, or manually by observers who visually count and record traffic on a hand-held electronic device or tally sheet. Traffic counts can be used by local councils to identify which routes are used most, and to either improve that road or provide an alternative if there is an excessive amount of traffic. Also, some geography fieldwork involves a traffic count. Traffic counts provide the source data used to calculate the Annual Average Daily Traffic (AADT), which is the common indicator used to represent traffic volume. Traffic counts are useful for comparing two or more roads, and can also be used alongside other methods to find out where the central business district (CBD) of a settlement is located. Traffic counts that include speeds are used in speed limit enforcement efforts, highlighting peak speeding periods to optimise speed camera use and educational efforts.
Highway 333 is a designation of three north–south state highways in Arkansas. One route begins at US Highway 64 (US 64) and runs north 17.20 miles (27.68 km) to Highway 7. A second highway begins at Searcy County Road 8 (CR 8) and runs north to US 65 near Marshall. A third segment connects Gilbert to the state highway system. All three highways were created and modified to their existing alignments between 1965 and 1974, and are maintained by the Arkansas Department of Transportation (ArDOT).
Traffic simulation or the simulation of transportation systems is the mathematical modeling of transportation systems through the application of computer software to better help plan, design, and operate transportation systems. Simulation of transportation systems started in the 1950s, and is an important area of discipline in traffic engineering and transportation planning today. Various national and local transportation agencies, academic institutions and consulting firms use simulation to aid in their management of transportation networks.
Highway 336 is a designation for two east–west state highways in the Arkansas Ozarks. Both are low traffic, two-lane, highways near Greers Ferry Lake. The longer segment was created in 1966, with the Higden segment created in 1972. Both current segments are maintained by the Arkansas Department of Transportation (ArDOT).
In transportation engineering, the K factor is defined as the proportion of annual average daily traffic occurring in an hour. This factor is used for designing and analyzing the flow of traffic on highways. K factors must be calculated at a continuous count station, usually an "automatic traffic recorder", for a year before being determined. Usually this number is the proportion of "annual average daily traffic" (AADT) occurring at the 30th-highest hour of traffic density from the year's-worth of data. This 30th-highest hour of traffic is also known as "K30" or the "Design Hour Factor". This factor improves traffic forecasting, which in turn improves the ability of designers and engineers to plan for efficiency and serve the needs of this particular set of traffic. Such forecasting includes the selection of pavement and inclusion of different geometric aspects of highway design, as well as the effects of lane closures and necessity of traffic lights. Engineers have reached consensus on identify K30 as reaching a reasonable peak of activity before high outliers of traffic volume are used as determinative of overall patterns. The K factor has three general characteristics:
Highway 267 is a designation for two state highways in White County. One route of 15.47 miles (24.90 km) begins at Highway 31 and runs northeast to Highway 367 in Searcy. A second route of 2.25 miles (3.62 km) begins at Highway 31 and runs east to Highway 13. Highway 267 Spur, a spur route of 0.90 miles (1.45 km) connects Highway 267 and Highway 31 north of Beebe. The highways are maintained by the Arkansas Department of Transportation (ARDOT).
Pavement performance modeling or pavement deterioration modeling is the study of pavement deterioration throughout its life-cycle. The health of pavement is assessed using different performance indicators. Some of the most well-known performance indicators are Pavement Condition Index (PCI), International Roughness Index (IRI) and Present Serviceability Index (PSI), but sometimes a single distress such as rutting or the extent of crack is used. Among the most frequently used methods for pavement performance modeling are mechanistic models, mechanistic-empirical models, survival curves and Markov models. Recently, machine learning algorithms have been used for this purpose as well. Most studies on pavement performance modeling are based on IRI.
Highway 262 is an east–west state highways in Woodruff County, Arkansas. The route is maintained by the Arkansas Department of Transportation (ARDOT).
Highway 364 is an east–west state highway in Cross County, Arkansas. The highway connects a series of rural communities and farmland to the principal north–south highways in Cross County. Highway 364 is maintained by the Arkansas Department of Transportation (ArDOT). A former designation, also in Cross County, connected Togo to the state highway system between 1973 and 1983.
Highway 207 is a north–south state highway in Dallas County, Arkansas. It was created in 1962 along a former county road. The route is maintained by the Arkansas Department of Transportation (ArDOT). A former designation in the same vicinity was deleted in 1973.
The 1992 Edition of the AASHTO Guidelines is out of date. The current edition is from 2018. The Gary Davis article was published in Transportation Research Record 1593, 1997. the date currently shown in the article is the date of an on-line posting.
