I-19

Current route in Arizona: Mexican border at Nogales to JCT I-10 at Tucson
Length: 101 km

I-19 is one of the two Interstates in Arizona that don't go between US states. It does, however, go between countries. I-19 connects the major border crossing at Nogales with I-10.

I-19 replaced the southmost section of US 89. After US 89 was decertified in 1992, the remaining stand-alone portions became Business Loop I-19. The northern leg, from Tucson to Green Valley, lost its Business Loop designation in 2003. The section in Nogales is still active.

This 1957 design (Illustration: ADOT) of the I-10/I-19 interchange was constructed in 1963. In 2002, ADOT reconstructed it it to eliminate the loop ramp and increase capacity.

Note that this diagram calls them by their pre-Interstate numbers, AZ 84 and US 89.

Well, almost. In addition to the metric signage, there are mileposts and MPH speed limit signs. (The latter don't specify the units.) The mixed kilometer/mileposts are going to be confusing.

ADOT kept the metric signs during the resigning project. (By the way, how does Mexico feel about ADOT resigning one mile of their highway?)

Ronald J. Wysocki informs me as of early August 1998, the milepost signs have been turned 90° to the highway, so that they are not readily visible.

As of 2007, the future of the metric signage is uncertain. ADOT may changed them to imperial measurements when the signs are next replaced.

Most of the southern exits on I-19 have a pole with a pair of lights like these, either on a wooden telephone pole or a light pole. These are industrial white globe lights, not standard traffic signal lights. The button is located on a pole by the intersecting street. I don't know what bus service uses them.

Unlike California, only a few miles of highways have call boxes on them. I-19 has most (all?) of them. AZ 51 in metro Phoenix had them at one time, but they were removed.

Click the name of an attraction to visit it
Exit numbers are based on kilometerposts

I-19 EXIT LIST
EXIT	NORTHBOUND EXITS Read down	SOUTHBOUND EXITS Read up
0	SPEED LIMIT 45	SPEED LIMIT 25
0		Downtown International Border
0		FREEWAY ENDS
1A		International St
1	SPEED LIMIT 55	SPEED LIMIT 45
1B	Western Ave	Western Ave
2	SPEED LIMIT 65	SPEED LIMIT 55
3	SPEED LIMIT 75	SPEED LIMIT 65
4	SOUTH Mariposa Rd	SOUTH Mariposa Rd
4	SOUTH Mariposa Rd	BORDER TRUCK ROUTE
8		Grand Ave TO EAST Patagonia
8		LEFT EXIT
12	Ruby Rd Nogales Ranger Station	Ruby Rd Nogales Ranger Station
12	Pena Blanca Lake Recreation Area	Pena Blanca Lake Recreation Area
17	Rio Rico Dr Yavapi Dr	Rio Rico Dr Yavapi Dr
22	Peck Canyon Rd	Peck Canyon Rd
22	BORDER PATROL CHECKPOINT	Peck Canyon Rd
25	Palo Parado Rd	Palo Parado Rd
29	Tumacacori Carmen	Tumacacori Carmen
29	Tumacacori National Historical Park	Tumacacori National Historical Park
34	Tubac	Tubac
34	Tubac Presidio State Historic Park	Tubac Presidio State Historic Park
40	Chavez Siding Rd Tubac	Chavez Siding Rd Tubac
42	Agua Linda Rd	Agua Linda Rd
48	Arivaca Rd	Arivaca Rd
53	Rest Area	Rest Area
56	Canoa Rd	Canoa Rd
63	Continental Rd	Continental Rd
63	Madera Canyon Recreation Area	Madera Canyon Recreation Area
65	Esparanza Blvd	Esparanza Blvd
69	Duval Mine Rd	Duval Mine Rd
69	Titan Missile Natl Historical Landmark	Titan Missile Natl Historical Landmark
75	Sahuarita Rd Sahuarita	Sahuarita Rd Sahuarita
80	Pima Mine Rd	Pima Mine Rd
87	Papago Rd	Papago Rd
87	SPEED LIMIT 65	SPEED LIMIT 75
92	San Xavier Rd	San Xavier Rd
92	San Xavier Mission	San Xavier Mission
92	SPEED LIMIT 55	SPEED LIMIT 65
95	Pascula Yaqui Pueblo Valencia Rd Tucson Airport	Pascua Yaqui Pueblo Valencia Rd Tucson Airport
98	Irvington Rd	Irvington Rd
99	Ajo Way	Ajo Way
99	Desert Museum Old Tucson	Desert Museum Old Tucson
101	EAST El Paso
102	27th St - 29th St Star Pass Blvd Silverlake Rd
	WEST Phoenix
101	SPEED LIMIT 55	SPEED LIMIT 55
EXIT	NORTHBOUND EXITS Read down	SOUTHBOUND EXITS Read up