Controlling Cajon Pass traffic during inclement weather

(4/15/13) – IE Transit Talking Points Short

The Transit Coalition is aware the micro-climate in the Cajon Pass area can become unstable at times. For instance, the skies could be clear in Victorville and it could be calmly drizzling in San Bernardino...Yet, the Cajon Pass which separates the regions could be very windy, wet and foggy. Commuters and regular travellers are also well aware that the Cajon Pass separates the inland chaparrals from the desert.

Since the weather through the Cajon Pass can become unpredictable, it would be wise for Caltrans and San Bernardino County to adopt measures to control the speed limit based on the current conditions. During normal conditions, the speed limit would be 65-70 mph, but if a layer of pea soup fog blankets the Cajon Pass, digital signs leading up to the affected area would warn drivers ahead of time to slow to a safe speed depending on the thickness of the fog. A sign such as “DENSE FOG AHEAD – 35 MPH ZONE 2 MILES” would be useful. Safety is paramount along steep-grade roadways, especially where the weather can be unstable.


  1. Rocket science isn't needed here but common sense.

    Installation and maintenance of raised lane reflectors should be number one on the list; placed at half the normal spacing.

    During heavy rain or fog the painted lane lines in portions of the upper grade all but disappear. As a result, vehicles start drifting where they don't belong.

    1. That would help, but also regulating the speed limit based on the current traffic conditions would too.


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