Table 1,,
Percentage of Worldwide Violent Attacks,,
"on Transportation, by Mode: 1998",,
,Mode,Percent
,Highways,24
,Maritime/piracy,21
,Bus,18
,Pipelines,12
,Rail,10
,Aviation,7
,Bridges,2
,Other,2
,Subway,1
"NOTE: Maritime/piracy includes both attacks on maritime facilities, including ports, and piracy of vessels. ",,

"SOURCE: U.S. Department of Transportation, Office of the Secretary of Transportation, Office of Intelligence and Security, Worldwide Terrorist and Violent Criminal Attacks Against Transportation—1998 (Washington, DC: 1999).",,