Proposed change to corner‑lot visibility rules fails after debate on safety and enforceability

Article 54, a citizen petition by Caitlin Monaghan, proposed amending section 5.3.12a of the zoning bylaw to clarify sight‑triangle placement and to allow fences higher than 3 feet on corner lots if the fence did not materially impede the vision of drivers and the fence opacity stayed under a set threshold. Monaghan emphasized safety benefits for schools and children and showed examples including the Arlington Children’s Center.

Director of Inspectional Services Mike Ciampa and several members urged caution, citing decades of traffic‑engineering guidance and the complexity of sight‑line calculations under varying conditions (vehicle heights, lighting, seasonal vegetation). Members debated enforceability and opacity measurement; JP Lewicki moved to lower the proposed opacity threshold from 35% to 25% (the Lewicki amendment passed 105–74–15). The Monahan (Monaghan) substitute as amended was then put to a vote and failed; the main motion (no action) remained the outcome after a voice vote seeking the two‑thirds margin for substitution.

Supporters argued the amendment would legalize many existing fences that are safe and would spare homeowners expensive variance processes; opponents urged reliance on established traffic engineering standards and warned about long‑term maintenance, climbing vegetation, and visual patterns that could impair drivers. The director of inspectional services noted that a number of neighboring towns use similar sight‑triangle dimensions and lower maximum heights, and that Arlington’s neighborhood multifamily districts (not Mass Ave/Broadway) are where section 5.3.12a applies.

Town meeting adopted the Lewicki amendment but did not substitute the main motion; the article remained no action.