Digital speed signs changing boatie behaviour

Thursday 25 June 2026

South Australian boaties are slowing down and making our waterways safer, following highly successful trials of electronic speed advisory signs.

Data collected by Marine Safety SA shows that signs installed at North Haven and St Kilda earlier this year have significantly improved compliance with the 4-knot water speed limit.

These signs deliver on Marine Safety SA’s commitment to leveraging technology for safer boating – a key priority of the state’s Recreational Boating Safety Strategy.

The data

The initial trial locations have seen a measurable shift:

• St Kilda: The average speed of operators approaching the camera has fallen by more than 30% (a reduction of over 2 knots).
• North Haven: Vessel speeds have slowed by nearly 15%.

Expansion of signage

Driven by these results, Marine Safety SA has expanded the initiative with two new digital signs now live in high-traffic areas:

• Barker Inlet (Metropolitan): Operating within a 7-knot speed zone.
• Eyre Peninsula (Lincoln Cove Marina): Located within a busy 4-knot zone, and is the first regional location.

How it works

Unlike cars, many boats lack accurate speedometers. These signs bridge that gap using radar technology and help educate boaties about the compliant speed without the fear of being penalised.

Vessels traveling at or below the limit trigger a green smiley face and their current speed. Vessels exceeding the limit receive a flashing red 'SLOW DOWN' alert.

Why Managing Speed Matters

Managing vessel speed is critical for protecting both people and the environment. High speeds and excessive wakes can:

• Increase the risk of serious accidents and injuries.
• Impact and endanger other waterway users.
• Threaten local marine life, including the vulnerable Port River dolphins.

Historical data highlights why this initiative is so vital. Over the past four years, more than a third of operators monitored were non-compliant with safety regulations, including speeding.

Nearly half of all public safety concerns reported via Marine Safety SA’s online tool were also related directly to speeding vessels.