In 2000, Idaho had 46,456 mi (74,763 km) of public roads and streets, some 95% of them rural. The major east–west highways are I-90, I-84 (formerly I-80N), and US 12; US 95, Idaho 55, US 93, and I-15 are among the most traveled north–south routes. Idaho had 1,219,851 registered vehicles—including 515,266 automobiles, 658,747 trucks, and 2,409 buses—in 2000, when there were 883,546 licensed drivers. Boise, Pocatello, and Idaho Falls have mass transit systems—which are bus lines.
There were 1,758 rail mi (2,829 km) used by the nine railroads operating within the state in 2000. Among the two Class I railroads, the Union Pacific Railroad serves southern Idaho, and the Burlington Northern crosses the panhandle. Amtrak provides limited passenger service to Pocatello, Boise, Shoshone, Nampa, and Sandpoint on two Chicago–Seattle trains. The modern airport at Boise is the state's busiest. In 2002, there were a total of 195 airports, 36 heliports, 5 seaplane bases, and 1 stolport. Other transport facilities are 6,100 mi (9,800 km) of pipeline, carrying virtually all the natural gas and most of the gasoline consumed in Idaho, and a Snake River port at Lewiston that links Idaho, Montana, and the Dakotas with the Pacific via 464 mi (747 km) of navigable waterways in Washington State.