I am a former 18 year resident of Portola Valley who know lives in Redwood City. If you drive along Middlefield Road, near the library and along Broadway between Main Street and El Camino, there are a number of sidewalk lights that are activated either by physical sensor or by a push of a button. Many other pedestrian crossings have are well lined and have the vibrant "Pedestrian Crossing" signs warning that drivers must stop for peds. I know where they are now and am always very alert and cautious when driving so to be aware of peds. A Pavlov's Theory, if you will. This sort of installation at both La Cuesta and La Mesa may 1) help slow auto traffic (with perhaps some Sheriff observation for awhile to reinforce Pavlov) and allow pedestrians to have a greater sense of safety. Making all parties aware that Alpine is not Hwy 280, yet still allowing easy traffic flow (except perhaps at those 2 times, AM/PM, that conjestion occurs) may be the answer.