Tamie McGowen with Caltrans says, unless there are major problems on the roads or Amber Alerts, the message will be on display through tonight...
"...and then we will sporadically use it on occasion to remind motorists that they need to continue joining us in this aggressive action to save water during this drought."
"We typically use (the signs) for traffic safety messages," says McGowen, "but in this case we worked with the Federal Highway Administration and because the governor has declared an emergency in terms of this drought we are able to get out there a very important message."
McGowen says the "Help Save Water" message will be on display through tonight and intermittently when there are no critical emergency or traffic safety messages or "Amber Alerts."
McGowen also says Caltrans is cutting back, by 50 percent, on the amount of water it uses to irrigate landscaping along the state's highways. She says the agency will also stop washing its vehicles, except when necessary for safety reasons.
Governor Jerry Brown has called on all Californians to voluntarily reduce water usage by 20 percent.
A long-range U.S. government forecast shows the drought in California will stick around.
The drought has farmers cutting back on watering, but some San Joaquin County growers say less water can mean a better crop.
The City of Sacramento Department of Utilities reports Friday that city water customers saved more than one-billion gallons of water last month.
California's economy will see modest growth in 2015, with jobs in home building being a bright spot, and the drought having slight impact, according to the latest University of the Pacific's latest Business Forecast.
It appears messages about the need for water conservation are beginning to get through to Californians.