Siam Tackles Duplicate Signs Crisis Plaguing Bangkok, Seoul, Lisbon

More than 340 duplicate street signs have been catalogued across Siam's central districts since January, according to figures released by the City Works Directorate last month. The tally covers redundant wayfinding panels, doubled heritage plaques, and overlapping traffic notices, physical clutter that urban planners say degrades both safety and civic identity. The audit, the first of its kind since 2019, gives the city its clearest picture yet of a problem that has compounded over two decades of piecemeal infrastructure upgrades.

The timing matters. Cities across Southeast Asia and Europe have spent the past three years aggressively rationalising their public signage after post-pandemic streetscape reviews exposed how much redundant hardware had accumulated during successive rounds of construction. Bangkok's Department of City Planning wrapped a two-year duplicate-signage removal programme along Silom Road and Sukhumvit in early 2025. Seoul completed a similar audit of its Jongno district in 2024, cutting physical sign counts by roughly 28 percent. Siam's own review arrives later than both, a fact that planning observers note puts pressure on city hall to move quickly now that the data exists.

What the Audit Found on the Ground

The worst concentrations in Siam are in the Riverside Quarter, where three successive road-widening projects between 2008 and 2021 left layers of directional panels pointing toward the same destinations, the Old Customs Pier, the night market on Chao Fah Road, and the Siam Heritage Museum on Thawarat Lane. The museum alone has seven separate plaques affixed to walls and poles within a 200-metre radius, four of which carry slightly different transliterations of its name. Near the Saphan Daeng intersection in the Northside neighbourhood, traffic engineers found eleven sign poles clustered within a 30-metre stretch, several of them carrying identical speed-limit notices installed by different contractor cycles.

The City Works Directorate has assigned the physical removal work to its Infrastructure Maintenance Unit, which has a budget allocation of 4.2 million baht for the current fiscal year to cover signage across all categories. That figure is a significant step up from the 1.8 million baht spent in 2023, but project coordinators have acknowledged it will not cover replacement of all damaged or outdated panels flagged in the audit by the December deadline. The unit has prioritised the Riverside Quarter and the Central Market district around Ratchadamnoen Avenue for first-phase removal, scheduled to begin the week of 14 July.

How Other Cities Have Managed It

The comparison with Lisbon is instructive. Portugal's capital ran its Sinalização Limpa programme from 2022 to 2024, targeting the Alfama and Baixa neighbourhoods. The city contracted a single logistics firm to pull and recycle obsolete metal panels, reducing per-sign removal costs to roughly €18 each by standardising the extraction process. Siam's current approach uses rotating teams from three separate municipal departments, Works, Transport, and Heritage, which critics say introduces coordination delays and inflates unit costs.

Seoul's experience points to a different lesson. The city paired its physical removal with a real-time digital registry, so that any new sign installed by a contractor or utility must be logged against existing infrastructure within 14 days or face a permit penalty. No comparable registration requirement currently exists in Siam, meaning that new duplicate signs can, and do, appear even as the current batch is being pulled down.

City hall has said it is studying the Seoul model. The Urban Development Committee is scheduled to consider a draft signage-registration bylaw at its next sitting on 22 July. If passed, the bylaw would require all public-facing sign installations to be submitted to a central GIS database maintained by the City Planning Office on Nawamin Road before permits are granted. Residents and businesses along the affected Riverside Quarter corridors should expect partial pavement closures and temporary boarding around sign poles during the first phase of removals. The Works Directorate has published a route map on its official portal showing which blocks are scheduled each week, worth checking before planning any deliveries or events near Chao Fah Road or Thawarat Lane this month.