Interstate 10, which runs southeast to northwest through town, connects Tucson to Phoenix to the northwest on the way to its western terminus in Santa Monica, California, and to Las Cruces, New Mexico and El Paso, Texas toward its eastern terminus in Jacksonville, Florida. I-19 runs south from Tucson toward Nogales and the U.S.-Mexico border. I-19 is the only Interstate highway that uses "kilometer posts" instead of "mileposts", although the speed limits are marked in miles per hour instead of kilometers per hour. COUNT 9
QSN1 Which interstate is the only one that uses kilometer posts instead of mileposts? ANS1 I-19 QSN2 Are the speed limits on I-19 marked in miles or kilometers? ANS2 miles QSN3 What border does I-19 come close to?  ANS3 U.S.-Mexico border QSN4 Which interstate would you take to go to Jackson Florida from Tuscon Arizona? ANS4 Interstate 10 QSN5 Which direction does I-10 run through Tucson? ANS5 southeast to northwest QSN6 What is the next major town to the west on I-10? ANS6 Phoenix QSN7 What is the next major town to the east on I-10? ANS7 Las Cruces, New Mexico QSN8 Which direction does I-19 run from Tucson? ANS8 south QSN9 What is unusual about I-19? ANS9 the only Interstate highway that uses "kilometer posts" instead of "mileposts"