Missouri voters are deciding several ballot issues and only one statewide office in Tuesday's elections.
Polls opened at 6 a.m., and election officials were expecting 27 percent turnout. That would be just above average for Missouri's August primaries.
Among issues facing voters is a proposed Constitutional amendment that would levy a three-quarters of a cent sales tax to fund more than 800 highway and transportation projects over the next decade. Another proposed Constitutional amendment would create a right to farm.
Incumbent State Auditor Tom Schweich is unopposed in the Republican primary in the only statewide office on the ballot. Five of Missouri's eight U.S. House members face primaries against lesser-known challengers.
Polls will officially close at 7 p.m. Tuesday.