Abstract: Guardrail, guardrail terminal, and support post designs that improve control of a vehicle during collisions are described. The disclosed designs also reduce the likelihood of intrusion into vehicle systems and the occupant compartment(s). Embodiments include folding and/or flattening of the guardrail and controlling the folded and flattened guardrail to avoid intrusion into the vehicle. Other embodiments include containing the guardrail in an impact head of a guardrail terminal, which also avoids vehicle intrusion.

Abstract: In an air conditioning system with a return air duct, a blower and a discharge duct, a by-pass duct is provided between the discharge duct and the return air duct such that a portion of the air being delivered by the blower is caused to be returned to mix with the incoming air from the return air duct before re-entering the blower. A chemical filter is provided in the by-pass duct such that gaseous pollutants are removed from the air flowing therethrough. With the continued recirculation of air through the system, the level of contamination in the air being delivered is eventually reduced to an acceptable level.

Abstract: A mounting bracket for a lamp fixture fixedly securable to a mounting pad on the fixture via a key-hole slot arrangement and providing adjustment for the fixture through an aiming range of nearly 180.degree..