I-19 highlighted in red
|Maintained by ADOT|
|Length||101.84 km  (63.28 mi)|
|South end||I-19 BL in Nogales|
|North end||I-10 in Tucson|
|Counties||Santa Cruz, Pima|
Interstate 19 (I-19) is a north–south Interstate Highway located entirely within the U.S. state of Arizona. I-19 travels from Nogales, roughly 300 feet (91 m) from the Mexican border, to Tucson, at I-10. The highway also travels through the cities of Rio Rico, Green Valley, and Sahuarita.
Having a total length of just over 63 miles (101 km), I-19 is the sixth-shortest primary (two-digit) Interstate Highway in the contiguous 48 states, where only I-97, I-86 (western), I-14, I-11, and I-2 are shorter.
While the highway is short, it is a very important corridor, serving as a fast route from Tucson and Phoenix (via I-10) to the Mexican border. The highway is a portion of the United States section of the CANAMEX Corridor, a trade corridor that stretches north from Mexico across the United States to the Canadian province of Alberta.
In Nogales, the southern terminus of I-19 is at West Crawford Street, adjacent to the international port of entry, and southbound travelers can continue into Nogales, Sonora, Mexico, via state-maintained surface roads, and connect with Mexico Federal Highway 15 either to the south or west of Nogales, Sonora. 
Starting from the southern terminus at kilometer post 0, I-19 initially heads briefly south then west on surface streets, navigating its way through the town of Nogales for 0.2 miles (0.32 km) before becoming an Interstate–grade freeway and making the turn to head north toward Tucson. It has interchanges with two other state highways near the southern end of the route, State Route 189 (SR 189) at exit 4 and SR 289 at exit 12. The interchange with SR 189 at exit 4 both serves to funnel traffic so as to bypass around Nogales, Arizona, and Nogales, Sonora, for travelers bound to or from Hermosillo or Mexico City, and provides for the continuous flow of freight and truck traffic through the larger Mariposa Port of Entry to Highway 15, which has its northern terminus at the US–Mexico border with SR 189 and its southern terminus 2,179 kilometers (1,354 mi) away in Mexico City.  After exiting Nogales to the north, I-19 passes near and around a series of sparsely-populated towns and retirement communities along the banks of the Santa Cruz River, including Rio Rico, Tubac, Amado, Green Valley, and Sahuarita. For several miles near Amado and Green Valley, the eastward view from I-19 provides scenic views of Madera Canyon and the Santa Rita Mountains in the Coronado National Forest. 
Just before entering Tucson, I-19 passes through the eastern section of the San Xavier Indian Reservation where it makes its only crossing of the Santa Cruz River. As I-19 enters the Tucson city limits, it has an interchange with SR 86 at exit 99 before reaching its northern terminus at an interchange with I-10. 
Nearly the entire route of I-19 follows, or is adjacent to, the former routing of US 89 and the Santa Cruz River, which flows northward from Mexico, through Tucson and usually disperses into the desert between Marana and the Gila River, southeast of Phoenix. Most of the time, much of the river is dry, but heavy storms can cause it to overflow its banks, flooding farmland before reaching the Gila River.
I-19 is unique among 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. However, the speed limit signs give speeds in miles per hour. According to the Arizona Department of Transportation (ADOT), metric signs were originally placed because of the push toward the metric system in the United States at the time of the original construction of the highway. 
I-19 had originally been signed as it was constructed, in a series of small signing contracts that used customary units.  In 1980, Arizona DOT awarded a single contract to install new signs which used metric units, to overlay English-unit expressions on some existing signs with metric-unit expressions, to install kilometerposts, and to provide bilingual signing in select locations. The signing scheme used in 1980 provided explicit units on advance guide signs, but not on interchange sequence signs or post-interchange confirmation (distance) signs.
The expressions on advance guide signs were of the form "2 km" for distances over 1 kilometer (0.62 mi) and "500 m" for distances under 1 kilometer (0.62 mi), with no provision for fractional kilometrages. On advance guide signs, the metric unit expressions "km" and "m" were placed on the baseline where "MILES" would otherwise have gone, but were sized so that their lowercase loop height matched the uppercase letter height of "MILES" on customary-unit signs.
The exception was a handful of advance guide signs for the SR 86 (Ajo Way) exit, which used "KM" (in uppercase, contrary to SI nomenclature) on the same baseline and at the same letter height as "MILES." The 1980 signing plans also provided design details for speed limit and advisory speed signs using metric units, with the limit values enclosed in a red circle on the speed limit sign and a black circle on the yellow-background advisory signs. These speed signs all had explicit units, with "km/h" below the circle enclosing the limit value. However, the advisory signs were cancelled by change order and not installed.
Had the metric speed limit sign been installed, the signed speed limit on I-19 would have been 88 kilometers per hour (54.7 mph), which is a close soft-conversion of the then-existing 55 miles per hour (88.5 km/h) national maximum speed limit. Information signs, to three distinct designs, were also placed at various locations on or near I-19 to advise motorists that the highway was signed in metric. Notwithstanding the metric legends, the signing plans were dimensioned entirely in feet and inches. 
In 1999, Arizona DOT awarded two contracts (administered as a single construction project) to renew the signs along the full length of I-19. The general approach toward metric signing differed from that taken in 1980. Explicit units were given not just on advance guide signs, but also on interchange sequence signs, post-interchange confirmation signs, and community interchange signs (the last-listed had not been used in 1980). On the distance signs, "km" appeared after each kilometer measurement except when one or more of the distances was a fractional kilometer.
In such cases, all the distances were given in meters with "meters" (written out in full, not "m") after each distance value. On distance signs in general, "km" or "meters" appeared on the same baseline and with the same letter height as the distance values, while advance guide signs were formatted as in 1980. Since a typical Arizona DOT freeway guide sign rehabilitation contract also replaces surface road signing near those roads' interchanges with the freeway, metric-unit signs also appeared on local roads near I-19, giving distances in kilometers to tourist attractions such as Mission San Xavier del Bac.
As was the case in 1980, the signing plans were dimensioned in feet and inches.  However, a number of signs near the Valencia Road interchange were replaced or amended when it was converted from a partial cloverleaf to a single-point urban interchange in 2000. One of these signs has a fractional kilometrage greater than 1 kilometer (0.62 mi), rendered as "1500 m," while others use "m" rather than "meters" as the unit expression. Metric unit expressions on the advance guide signs installed or modified as part of this contract appear on the same baseline as the metric values, rather than on a raised baseline as on other I-19 advance guide signs. Again, the plans were dimensioned in feet and inches. 
Citing motorist confusion arising from the metric signs on I-19, Arizona DOT's Tucson district announced that new signs on I-19 would use United States customary units. To avoid the cost of replacing the metric signs all at once, signs would be replaced in specific areas of the freeway during construction projects in those areas.  New signs were put into place between Exit 99 (Ajo Way) and Exit 101 (I-10) in 2004 after the completion of the new Interstate 10–Interstate 19 interchange.
As of 2010, the remainder of the project has been stalled due to local opposition, particularly from businesses that would have to change their directions. 
A recent reconstruction project at the Interstate's northern terminus with I-10 in Tucson (at the interchange commonly called the Crossing) was begun in 2002 and completed in August 2004. 
The first sections of Interstate 19 to be opened to traffic were a three-mile (4.8 km) stub, from I-10 to Valencia Road, in 1962 and a two-mile (3.2 km) stretch in Green Valley in 1963. The freeway between Rio Rico and Nogales, Arizona was completed in 1974. The major section between Green Valley and Rio Rico was finished in 1978. The official completion date of the I-19 segment between Tucson (km 100) and Green Valley (actually Helmet Peak Road at km 75) was February 12, 1972. A 1978 project report for the Arizona Department of Transportation lists entire I-19 project as "completed", which includes segments between Green Valley and Nogales, Arizona.
I-19 is a very heavily traveled corridor in the Tucson metro area. The freeway is currently two lanes in both directions in all parts besides where it meets with I-10, where it is four lanes. Plans call to expand the freeway to up to five lanes in each direction by 2030 from the crossing with I-10 to San Xavier Road.  Current plans call for the widening from Irvington to Ajo, bringing the freeway to three lanes in each direction.  I-19 is also part of the proposed I-11 corridor. 
|Santa Cruz||Nogales||0.00||0.00||I-19 BL (Grand Avenue) / Crawford Street||ADOT defines this intersection as southern terminus; former US 89 / SR 93|
|0.28||0.17||West Street||At-grade intersection; south end of freeway; road continues as Compound Street|
|0.71||0.44||1A||International Street||Southbound exit only|
|1.90||1.18||1B||Western Avenue||Signed as exit 1 northbound|
|4.76||2.96||4||SR 189 (Mariposa Road)|
|||8.55||5.31||8||I-19 BL (Grand Avenue)||Southbound left exit and northbound entrance; former US 89 / SR 93|
|Rio Rico||12.42||7.72||12||SR 289 (Ruby Road)|
|17.53||10.89||17||Rio Rico Drive / Yavapai Drive|
|22.45||13.95||22||Peck Canyon Road|
|||25.17||15.64||25||Palo Parado Road|
|||29.34||18.23||29||Tumacacori-Carmen||Tumacácori National Historical Park|
|||40.10||24.92||40||Chavez Siding Road|
|||42.84||26.62||42||Agua Linda Road|
|Pima||Green Valley||56.26||34.96||56||Canoa Road|
|Sahuarita||69.72||43.32||69||Duval Mine Road||Former US 89 / SR 93; Titan Missile Museum|
|80.32||49.91||80||Pima Mine Road||Desert Diamond Casino, Tohono O'odham Nation|
|||87.98||54.67||87||Papago Road||Dead end, U-turn only|
|||92.04||57.19||92||San Xavier Road||Mission San Xavier del Bac|
|Tucson||95.10||59.09||95||Valencia Road – Tucson||Tucson International Airport|
|99.97||62.12||99||SR 86 (Ajo Way)|
|101.63||63.15||101||I-10 east – El Paso||Northbound exit and southbound entrance; I-10 exit 260|
|101.84||63.28||102||29th Street / 22nd Street / Silverlake Road / Starr Pass Boulevard||Northbound exit and southbound entrance|
|102.08||63.43||—||I-10 west – Phoenix||Northern terminus; I-10 exit 260|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|
|Length||5.88 mi  (9.46 km)|
Interstate 19 has one business route which begins at the Mexican border in Nogales near the southern end of the Interstate. I-19 Business follows Grand Avenue in Nogales and has intersections with SR 82 and SR 189 before terminating at I-19 just north of Nogales. The route follows the former alignment of US 89 and SR 93, back when both highways traversed through southern Arizona.
The entire route is in Santa Cruz County.
|Nogales||0.00||0.00||Fed. 15 south||International border with Mexico; southern terminus; continues south as Mexican Federal Highway 15|
|0.14||0.23||To I-19 north (Crawford Street)||ADOT defines this intersection as southern terminus of I-19|
|1.66||2.67||SR 82 east (Patagonia Highway) – Patagonia|
|2.77||4.46||SR 189 south (Mariposa Road)|
|||5.88||9.46||I-19 north||Northern terminus; no access to I-19 south|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|
- Staff (January 6, 2009). "2007 ADOT Highway Log" (PDF). Arizona Department of Transportation. pp. 137–45. Retrieved January 13, 2010.
- Google (February 15, 2008). "Overview Map of I-19" (Map). Google Maps. Google. Retrieved February 15, 2008.
- Calculate your route (Map). Michelin. Retrieved August 11, 2010.
- Holley, Denise (May 14, 2009). "ADOT Defends Replacing Metric Signs along I-19". Nogales International. Retrieved April 23, 2014.
- One example of such a contract was Arizona federal-aid project I-19-1(65), covering I-19 between its Nogales terminus and the Otero TI (title sheet signed August 7, 1970).
- Construction plans for Arizona federal-aid project I-19-1(81) (title sheet signed January 17, 1980).
- Construction plans for Arizona federal-aid projects NH-19-1(110) (Arizona DOT TRACS H260701C) and NH-19-1(116) (TRACS H260702C) (most sheets sealed March 1997).
- Construction plans for Arizona federal-aid project ACNH-19-1(127) (TRACS H260901C) (most sheets sealed June 1999).
- Cañizo, Susanna (January 19, 2004). "Some I-19 Metric Signs Going". Arizona Daily Star. Tucson, AZ. Archived from the original on February 23, 2005. Retrieved June 13, 2012.
- Lacey, Mark (September 14, 2010). "Metric Interstate Divides Arizonans". The New York Times. Retrieved September 14, 2010.
- Staff. "Home Page". The Crossing: I-10/I-19 Interchange. Arizona Department of Transportation. Archived from the original on February 7, 2005. Retrieved November 27, 2011.
- http://www.azdot.gov/docs/default-source/projects/final-design-concept-report-and-final-environmental-assessment-report-vol-1-.pdf?sfvrsn=4[ full citation needed]
- Arizona Department of Transportation. "Interstate 19: Ajo Way Traffic Interchange". Arizona Department of Transportation. Retrieved September 25, 2014.
- ADOT Media Relations (December 4, 2015).
"Interstate 11 receives designation in federal transportation funding bill" (Press release). Arizona Department of Transportation. Retrieved December 7, 2015.
The Fixing America’s Surface Transportation Act, or FAST Act, formally designates Interstate 11 throughout Arizona. It states that the I-11 corridor will generally follow Interstate 19 from Nogales to Tucson, Interstate 10 from Tucson to Phoenix, and US 93 from Wickenburg to the Nevada state line. From there, the Interstate 11 corridor extends north through Nevada, and is designated as an interstate highway north of Las Vegas, through Reno, connecting to Interstate 80.
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