This decision affirms a summary judgment for defendant in a suit by the heirs of a driver killed in a head-on collision triggered by the presence of a deer on the highway.  Defendant was entitled to design immunity under Gov. Code 830.6.  The design of the highway was causally linked to the accident.  Caltrans approved the planned design of the highway at that location.  For purposes of design immunity, it was not necessary for Caltrans to expressly consider each of the possible alternative designs that plaintiff argued would have been more protective of the driving public.  The design was reasonable.  Over a 10 year period, 40 million cars had passed the spot of the accident without any deer-caused accident or significant number of head-on collisions.