DES MOINES, Iowa (AP) — Those traveling on Iowa's highways this holiday weekend should know that state and local law enforcement agencies are out in full force. The Iowa Department of Transportation says the extra effort began Friday and will continue through Tuesday morning in an attempt to taken drunk drivers and speeders off the roads. The National Highway Traffic Safety Administration says 164 people were killed in crashes involving at least one drunken driver over the three-day Fourth of July holiday last year. Iowa roadway fatalities are up about 25 percent this year from the same time last year.Read more on NewsOK.com