Approximately 100 cars were stuck near Palomar Mountain Tuesday due to icy conditions on the roads, CHP officials said.
Traffic along South Grade Road and Canfield Drive was backed up all the way to the observatory at about 1:30 p.m. as officials worked to clear the roads.
Some tow trucks were requested to assist in clearing the road.
"I was just driving down when I started sliding down and pressed on the brakes and it was still going," said Martin Briseno of Vista.
The car stopped just short of a steep embankment, leaving Briseno and his friends wondering if it was worth the drive up the mountain.
Weather in the area was relatively cold on Tuesday, with daytime temperatures in the low 40s and nighttime temperatures dipping to freezing levels overnight.
"There were some people who panicked thinking they weren't going to get back home," said Palomar Mountain Fire Chief George Lucia.
Sand trucks eventually helped stuck cars get a better grip on the roadway.
Lucia reminds drivers to bring chains in case they're needed and to fill up with gas since there is no gas station on Palomar Mountain.