What began as a RV fire on Interstate 25 not far from Larkspur led grass to ignite as well, causing traffic troubles and delays in both directions of the highway Thursday afternoon.

A call first came in about the blaze at around 11:45 a.m. Larkspur Fire Protection District Division Chief Charles Walden says a large RV caught fire in the southbound lanes of I-25 -- and that blaze spread to the trailer it was towing.

Both have been declared a total loss.

The fire then spread to the grass, where it burned up to a quarter-acre and damaged the pavement and guardrail, Walden said.

The Colorado Department of Transportation says I-25 was briefly closed for crash cleanup, but now, every lane is back open but one in the southbound directions.

Videos from traffic cameras in the area showed long backups Thursday afternoon.

Walden says Castle Rock Fire assisted with the RV fire and Tri-Lakes Fire put out hte crash fire.