Bollards: Why and What

Original Article ↗ Hacker News Discussion ↗

Role and effectiveness of bollards

  • Widely seen as cheap, simple, and often life‑saving where cars can intrude on pedestrian space (bus stops, storefronts, corners, greenways, terror‑attack targets).
  • Advocates stress that bollards “work even if courts don’t”: they physically stop vehicles regardless of lax enforcement or light sentences.
  • Others argue bollards should be part of a broader toolkit, not a universal cure; if you “need 200 bollards” on a street, the design is probably wrong.

Where and how to use them

  • Strong support for bollards at:
    • Bus stops, schools, and places where cars park nose‑in toward buildings.
    • High‑risk corners and intersections.
    • Places with past “car into building” crashes.
  • Several point out bad implementations:
    • Bollards on bike paths that sit in the travel line, causing severe or fatal crashes.
    • Weak “flex posts” marketed as bollards that don’t stop cars, only nudge behavior.
  • Debate over guardrails placed outside sidewalks, protecting cars more than pedestrians.

Alternatives and complements

  • Many argue physical traffic calming (narrow lanes, curves, chicanes, speed bumps, trees, raised crossings) should come before or alongside bollards.
  • Strong emphasis on lower design speeds; Europe cited as example where street form, not just signs, keeps speeds down.
  • Mixed views on cameras: some see them as cheap and effective; others cite plate removal, legal bans, and “after‑the‑fact” enforcement limits.
  • Jersey barriers, fences, planters, and “artistic” or landscaped protection discussed as variants.

Costs, aesthetics, and political will

  • Skeptics highlight expense, ugliness, construction complexity, and emergency‑vehicle constraints, especially if applied “everywhere.”
  • Supporters counter that current car‑centric design and crash damage are already costly and ugly; the real issue is political will and priorities.

Liability and responsibility

  • Some want cities sued or engineers held criminally liable for predictable, preventable harms; others warn this leads to risk‑averse over‑engineering or drives talent out of public roles.
  • General agreement that current US practice prioritizes motorist convenience and vehicle safety over pedestrian protection.

Data and risk perception

  • Multiple disputes over:
    • Whether non‑highway speed limits are already appropriate.
    • The relative importance of vehicle size vs. speed.
    • How many pedestrian deaths bollards would realistically prevent.
  • Pedestrian deaths mostly occur away from intersections and at night in cited US data, leading some to question corner‑bollard focus and to emphasize visibility, speed, and impairment instead.