Interstate 19

From Wikipedia, the free encyclopedia

Interstate 19 Main route of the Interstate Highway System
Length:	63.35 mi[1] (101.95 km)
South end:	MX 15 at Mexican border at Nogales, AZ
North end:	I-10 in Tucson, AZ
State Routes in Arizona

Interstate 19 (abbreviated I-19) is an intrastate interstate highway located entirely within the state of Arizona, United States. It goes from Nogales, Arizona at the Mexican border to Tucson, Arizona at Interstate 10.

Contents 1 Major cities 2 Intersections with other interstates 3 Spur routes 4 History 5 Notes 6 Exit list 7 References

[edit] Major cities

Bolded cities are officially-designated control cities for signs.

• Nogales, Arizona
• Tucson, Arizona

[edit] Intersections with other interstates

• Interstate 10 in Tucson, Arizona

[edit] Spur routes

None

There are two Business Loops: One through Green Valley and Sahuarita, Arizona, and the other in Nogales, Arizona.

[edit] History

Nearly the entire route of I-19 follows or is adjacent to the routing of (former) U.S. Highway 89 and the Santa Cruz River, which flows northward from Mexico, through Tucson and eventually disperses into the desert between Tucson and Phoenix. Most of the time, much of the river is dry, but heavy storms can cause it to overflow its banks.

The official "completion" date of the I-19 segment between Tucson (km 100) and Green Valley, Arizona (actually Helmut Peak Road at km 75) was February 12, 1972. A 1978 Project Report for Arizona Dept. of Transportation lists entire I-19 project as "completed," which includes segments between Green Valley and Nogales, Arizona.

[edit] Notes

Interstate 19 is unique amongst US Interstates, because signed distances are given in meters (hundreds or thousands as distance-to-exit indications) or kilometers (as distance-to-destination indications), and not miles. Speed limit signs give speeds in miles-per-hour, however. According to the Arizona Department of Transportation (ADOT), metric signage was originally placed because of the "metric system push" in the United States at the time of the original construction of the highway.^{[citation needed]}

Recently, the Arizona Department of Transportation announced that they would convert metric signs back to United States customary units in stages, replacing signs in specific areas of the freeway during construction projects in those areas.[1] This is due to the high cost of replacing all the metric signs at once. New signs were put into place between Exit 99 (Ajo Way) and Exit 101 (Interstate 10) in 2004 after the completion of the new Interstate 10-Interstate 19 interchange.

In Nogales, Arizona, the southern terminus of I-19 is adjacent to the international port of entry, and southbound travelers can continue into Nogales, Sonora and connect with the northern terminus of Mexico Federal Highway 15.

A recent reconstruction project at the Interstate's northern terminus with Interstate 10 in Tucson, Arizona (at the interchange commonly called "The Crossing") was begun in 2002 and completed in August 2004. [2]

[edit] Exit list

County	Location	Mile	#	Destinations	Notes
United States–Mexico border continues as MX 15
Santa Cruz	Nogales		1	Western Avenue, Target Range Road
			4	Mariposa Road (State Route 189)
			8	Business Loop 19/US 89 south |Southbound only
			12	Route 289 (Ruby Road)
			17	Rio Rico Drive, Yavapai Drive
			22	Peck Canyon Road
			25	Palo Perado Road
			29	Santa Gertudis Lane	Tumacacori National Historical Park
			34	Aliso Spring Road
			40	Chavez Siding Road
			42	Agua Linda Road
			48	Arivaca Road
Pima			56	Canoa Road
	Green Valley		63	Continental Road
			65	Esperanza Boulevard
			69	Duval Mine Road / Business Loop 19 North
	Sahuarita		75	Helmet Peak Road / Sahuarita Road
	Tohono O'odham Nation		80	Pima Mine Road
			87	Papago Road
			92	San Xavier Road
	Tucson		95	Valencia Road
			98	Irvington Road
			99	Ajo Way
			101	Interstate 10

[edit] References

• Arizona Roads
• Western Exit Guide - Interstate 19 Arizona
• Interstate 19 at Larry's Phat Page

1. ^ Route Log - Main Routes of the Eisenhower National System Of Interstate and Defense Highways - Table 1

edit Main Interstate Highways (multiples of 5 in pink)
4	5	8	10	12	15	16	17	19	20	22	24	25	26	27	29	30
35	37	39	40	43	44	45	49	55	57	59	64	65	66	66 (W)		68
69	70	71	72	73	74	75	76 (W)		76 (E)		77	78	79	80	81	82
83	84 (W)		84 (E)		85	86 (W)		86 (E)		87	88 (W)		88 (E)		89	90
91	93	94	95	96	97	99	(238)		H-1		H-2		H-3
Unsigned			A-1		A-2		A-3		A-4		PRI-1		PRI-2		PRI-3
Lists		Main - Auxiliary - Suffixed - Business - Proposed - Unsigned Gaps - Intrastate - Interstate standards - Replaced