The Texas Department of Transportation will make 4,386 traffic counts in the Dallas area through July 19.

The 24-hour counts will be for on-system roadways only, or those that belong to the state and federal government. This includes interstates, state highways, farm-to-market roads, loops, spurs and bypasses, but not city streets or county roads.

“Accurate traffic counts are taken annually by TxDOT during the summer,” a spokesman said. “Results of these counts are important because they are used for area growth projects and in statewide funding formulas.”

The formulas used by TxDOT determine how much money will be made available to the seven-county area that makes up Dallas, Denton, Collin, Rockwall, Ellis, Navarro and Kaufman counties.

Motorists are advised to drive with caution during this time as TxDOT’s contract personnel may be seen on bridges, overpasses and parked along various highways.