Interstate 470 (Kansas)

Interstate 470
Dr. Martin Luther King Jr. Memorial Highway
Route information
Maintained by Kansas Department of Transportation and Kansas Turnpike Authority
Length:	13.72 mi[1] (22.08 km)
Existed:	October 21, 1960 – present
Major junctions
West end:	I-70 / US-40 / K-4 / US-75 in Topeka
	US-75 in Topeka I-335 / Kansas Turnpike in Topeka
East end:	I-70 / Kansas Turnpike / US-40 / K-4 in Topeka
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Kansas numbered highways ← I-435 I-635 →

Interstate 470 (I-470) is a 13.72-mile (22.08 km) loop highway that bypasses the downtown area of Topeka, Kansas. I-470 begins at an interchange with Interstate 70 in western Topeka and heads generally southeast, running concurrent with U.S. Route 75 (US-75). The concurrency with US-75 ends 5.74 miles (9.24 km) later at the Burlingame Road interchange. I-470 becomes part of the Kansas Turnpike at its junction with Interstate 335. From there, the highway heads generally northeast through the southeastern sections of Topeka. After traveling 7.03 miles (11.31 km) as the Kansas Turnpike, I-470 reaches its eastern terminus with Interstate 70. The highway has annual average daily traffic values as high as 43,000 west of Gage Boulevard to as low as 10,370 near the eastern terminus with Interstate 70. As an interstate highway, Interstate 470 is a part of the United States National Highway System. The non-turnpike portions of the highway are maintained by the Kansas Department of Transportation, while the turnpike portion is maintained by the Kansas Turnpike Authority.

The Kansas Turnpike was opened in the 1950s, comprising the eastern portion of the route. In the late 1950s construction began on the western portion of I-470, and on October 21, 1960, the western section of I-470 was dedicated and opened to traffic. In 1982, Interstate 470 was designated as "Martin Luther King Jr. Memorial Highway". The routing of I-470 has not changed since the completion of the highway.

Route description

Free segment

I-470 eastbound at Topeka Boulevard interchange

Interstate 470 begins on the west side of Topeka at an interchange with I-70, US-40, and K-4. US-75 approaches the interchange from the east and joins I-470. The two routes head southeastward along the western edge of the city.^[2] Along this stretch of the Interstate, there are three interchanges; Huntoon/Wanamaker, 21st, and 29th/Fairlawn. Because of both the southeast-to-northwest alignment of the road and the proximity of two cross-streets, the Huntoon/Wanamaker and 29th/Fairlawn interchanges are each made up of two half-diamond interchanges, with entrances and exits on two different streets depending on direction. At the Huntoon/Wanamaker interchange, traffic leaving eastbound I-470 is deposited onto Huntoon Street. Vehicles merging onto eastbound I-470 must access the entrance ramp from Wanamaker Road. The intersection of Huntoon and Wanamaker is adjacent to the freeway.^[3] The 29th/Fairlawn interchange is constructed similarly to the Huntoon/Wanamaker interchange, while the 21st Street interchange is a standard diamond interchange. Through southern Topeka, I-470 / US-75 curve to the east-southeast where they intersect Gage Boulevard. Further southeast, US-75 splits away from I-470 at a complex interchange with Burlingame Road.^[1] Just east of the US-75 interchange, a trumpet interchange provides access to Topeka Boulevard.

Kansas Turnpike segment

The highway then passes through a toll plaza and merges onto the Kansas Turnpike, starting the tolled portion of the highway. This junction also marks the northern end of I-335. I-470 and the Kansas Turnpike head northeast towards I-70.^[4][5] The tollway continues northeastward through southeastern Topeka, passing near to Lake Shawnee and eventually reaching I-470's terminus at I-70, which the turnpike carries east.^[6]

Maintenance

The non-turnpike portion of the freeway is maintained by the Kansas Department of Transportation (KDOT). As part of this role, KDOT surveys traffic on Kansas highways in terms of average annual daily traffic (AADT). In 2011, KDOT calculated that as few as 10,400 vehicles used I-470 daily along the Kansas Turnpike near the I-70 interchange and as many as 41,300 vehicles used I-470 daily between the Gage Boulevard interchange and the 29th Street interchange.^[7] The portions of I-470 that are part of the Kansas Turnpike fall under the purview of the Kansas Turnpike Authority, which is responsible for operating and maintaining the Kansas Turnpike. Being part of the Interstate Highway System, the entirety of I-470 is listed on the National Highway System, a system of roads that are important to the nation's economy, defense, and mobility.^[8]

History

1955 map showing planned Interstate highways through Topeka

The section of I-470 that now runs along the Kansas Turnpike was opened in 1956, and was the first part of I-470 to be built.^[9][10] After the founding of the Interstate Highway System that same year, several Interstate freeways were planned through Topeka, including I-70 and I-470.^[11] Construction began on I-470 after I-70's completion to Topeka. The segment of the I-470 freeway from the I-70 interchange to the Kansas Turnpike, most of which is concurrent with US-75, was built by Koss Construction Company and was under construction until 1960.^[12][13] On October 21, 1960, the western section of I-470 was dedicated by the state highway department and the Kansas Turnpike Authority and opened to traffic.^[13] Since completion of the freeway, the route has not been changed.^[14] In 1982, Interstate 470 was dedicated as "Martin Luther King Jr. Memorial Highway".^[15]

Exit list

The exits on the Kansas Turnpike portion of I-470 follow the Turnpike's mileposts. The entire route is in Topeka, Shawnee County.

mi[6][16]	km	Exit	Destinations	Notes
0.00	0.00	1A	I-70 / US-40 / K-4 / US-75 north – Salina, Kansas City	I-70 exit 355. Westbound exit and eastbound entrance, exit 1A is for 70 east; west end of US-75 overlap. West end.
1.05	1.69	1B	Huntoon Street, Wanamaker Road
2.22	3.57	2	21st Street
3.35	5.39	3	29th Street, Fairlawn Road
4.30	6.92	4	Gage Boulevard
5.74	9.24	5	US-75 south / Burlingame Road	East end of US-75 overlap
6.6	10.6	6	Topeka Boulevard	Last free exit eastbound; former US-75; also provides access to Kansas Avenue
6.63	10.67	South Topeka Interchange Toll Plaza West end of Toll Road
6.69	10.77	177	I-335 / Kansas Turnpike south – Emporia, Wichita	West end of KTA overlap; I-470 exits turnpike via exit 177 westbound
13.72	22.08	182	I-70 west / US-40 / K-4 – Topeka, Valley Falls	Eastbound exit and westbound entrance
		183	I-70 / Kansas Turnpike east – Lawrence, Kansas City	Eastbound exit and westbound entrance; east end of KTA overlap; east end of I-470; road continues as I-70 east / Kansas Turnpike.
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus       Tolled

See also

• Kansas portal
• U.S. Roads portal

References

External links

Route map: Bing / Google

• Media related to Interstate 470 (Kansas) at Wikimedia Commons
• Kansas Highway Maps: Current, Historic, KDOT

Auxiliary routes of Interstate 70
Colorado 270 4701 Kansas 470 670 Missouri 170 270 470 670 Illinois 270 Ohio 270 470 670 West Virginia 470 Maryland 1701 270 270 Spur 370
1Former