A car fire on the highway blocked part of I-84 in Danbury on Saturday.  The Danbury Fire Department was called to the area of Exit 4 and quickly extinguished the flames.  State Police kept most of the highway open, but at reduced speed and lanes. The driver was uninjured, and the Fire Marshals Office is investigating the cause.  The Fire Department is reminding motorists to  slow down, and move away from the lane the emergency workers are operating in when approaching an emergency on the highway.