New traffic signals give pedestrians a head start in Des Moines

Catch up quick: The concept of providing an advanced walk signal lasting three to seven seconds dates back to the 1960s.

• LPIs have become a common safety measure in recent years, with safety guidelines adopted by the Federal Highway Administration (FHWA).

Driving the news: DSM recently installed LPIs at 10 intersections in the city, with another planned for the intersection of Ninth Street and University Avenue in the coming months, city engineer Steve Naber tells Axios.

By the numbers: The cost of the devices can be as little as $200 at locations with existing crosswalk technology.

• According to the FHWA, they reduce pedestrian-vehicle crashes by 13%.

Friction point: Safety advocate Carol Maher tells Axios that she believes the city has missed opportunities in recent months to expand the use of LPIs faster by incorporating the technology into upcoming street project plans.

The other side: Adding LPIs at incorrect spots can increase vehicle congestion, driver confusion and crashes, Naber said.

Yes, but: The city continues to review data and evaluate potential new sites, including along Second Avenue from Court Avenue to I-235, Naber said.

• That's an area Maher believes has potential for significant LPI safety benefits.

The intrigue: Des Moines police last month began one of their first targeted crosswalk enforcement operations in years after 12 DSM pedestrians were killed by vehicles since 2023.

The bottom line: Des Moines is leaning on street design — not just tickets — to change driver behavior and protect pedestrians.