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Public Works proposes new guardrail criteria; staff to prioritize high‑speed hazards and crash patterns
Summary
Public Works presented proposed guardrail guidelines that would tighten when guardrails are installed on existing roadways. Staff said fences generally are not a warrant for guardrail and described a flow chart of criteria including posted speed (≥40 mph), clear‑zone hazards and crash patterns.
Kathy Valencia, Transportation Project Delivery Manager in Public Works, presented draft guardrail guidelines aimed at standardizing responses to frequent citizen requests for guardrails on existing roadways.
Valencia said the city received many retrofit guardrail requests and that guardrail is a high-cost countermeasure that is not always the safest engineering response. Quoting AASHTO, Valencia said: “Guardrail is meant to reduce the probability of a vehicle striking an object that is less forgiving than striking the guardrail itself.” She told the committee that in urban areas the typical clear zone is 4–6…
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