Washington (CNN) -- Drivers of commercial trucks and buses are prohibited from texting under federal guidelines that U.S. Transportation Secretary Ray LaHood announced Tuesday.

"We want the drivers of big rigs and buses and those who share the roads with them to be safe," LaHood said in a statement. "This is an important safety step, and we will be taking more to eliminate the threat of distracted driving."

The prohibition is effective immediately. Truck and bus drivers who text while driving commercial vehicles may be subject to civil or criminal penalties of up to $2,750, the Department of Transportation said in a news release.

The release did not offer specifics on how the prohibition will be enforced.