As a winter storm arrived in Southern California Thursday, mountain communities were hit with heavy snowfall, creating dangerous driving conditions. Travelers making their way through San Bernardino County and the Grapevine are advised to take extreme caution as limited visibility due to heavy rainfall,

The snowfall created issues along Highway 18 and at two dozen vehicles remain stuck. Authorities said snow chains are required for those who don’t have a four-wheel drive.

As a significant storm system made its way through California, a snowblast hitting Southern California mountain town communities forced many people to abandon their vehicles Thursday evening. California Highway Patrol told local station KNBC-TV that it received several calls Thursday night from drivers stuck in the snow.