A blown tire set a tractor trailer on fire late Tuesday and led to significant delays along two San Diego highways during the evening commute. Several lanes of northbound Interstate 15 were closed when a delivery truck caught fire at 1:30 p.m. beneath the Miramar Way exit sign. The driver managed to escape injury but the fire destroyed the truck and sent thick smoke over I-15 and State Route 163. Investigators could not confirm the truck driver was working for Amazon but an insurance investigator told NBC 7 he was hired by the company.