Spring truck weight restrictions on state highways began March 15 for Minnesota's south, southeast and Twin Cities Metro area frost zones.

Winter load increases and overweight permits remain in place for the state's central, north-central and north frost zones.

In addition, the Houston County Highway Dept. announced weight restrictions for its roadways as well as town roads and city streets. Any roadway not posted in the county has a weight limit on any single axle that shall not exceed 5 tons on an unpaved street or highway and 10 tons on a paved street or highway, any single axle. (M.S. 169.87).

MnDOT and government officials limit truck weights to prevent damage to roads weakened during the spring thaw.

Spring load restriction dates and the six frost zones in Minnesota are listed at www.mrr.dot.state.mn.us. Click on "Seasonal Load Limits," then click on "Spring Load Restrictions" for the most up-to-date information.

The information also is available toll-free by calling 1-800-723-6543 in the United States and Canada.

A county map showing the spring load restrictions for county roads is available for download at www.co.houston.mn.us, click on Highway Dept. listings.

Ending dates for spring load restrictions get decided by monitoring road strength as weather conditions change. All changes are made with a minimum three-day notice.

Travelers can get up-to-date information on road conditions, construction and weather reports from MnDOT's 511 traveler information service at www.511mn.org.