A truck driver was injured in a crash on I-84 in Danbury yesterday afternoon.  Shortly before 4 o'clock, a 40-year old man was headed eastbound in the area of exit 7 when he struck the wire rope guardrail in the median.  The Brookfield-based tree service truck also hit a light pole, severing it from the concrete base.  The truck ended up on an embankment about 75 feet from the roadway.  The driver was transported to the hospital due to his injuries.  The vehicle was towed from the scene.  The crash was cleared shortly before 6:30pm.  The case remains under investigation.