a division of the u.s. department of transportation, the federal motor carrier safety administration (fmcsa) regulates nearly all aspects of the trucking industry. in 2018, 885 large truck occupants died, while 4,678 people died in collisions with large trucks. truck drivers are limited by the number of daily and weekly hours they may drive, the roads and highways they may drive upon, and a lower legal definition of drunkenness. the federal highway administration has established 0.04 percent as the blood alcohol concentration (bac) level at or above which a cmv driver is deemed to be driving under the influence of alcohol. states maintain a bac level between 0.08 and 0.10 percent for non-cmv drivers. in some states, trucks also have special speed limits, in addition to restrictions on driving in certain lanes (normally the far right lanes of multi-lane highways).