EPD says just after 9 Tuesday morning, a Ford Ranger heading east on the Lloyd, tried to get behind a stopped flat bed truck at the light at Saint Joseph Avenue.
Officers say they don't know why the driver of the ranger didn't stop, but the crash caused the flat bed to go through the windshield.
Police say the driver of the Ranger was in and out of consciousness, but had taken a turn for the worse before being taken to the hospital.
The intersection was closed for several hours while crews cleared the scene. The investigation into the crash continues.