Dorritt Street – Proposed Full-Width Speed Humps Installation

Dorritt Street currently contains two short speed cushions installed on the eastbound lane prior to the stop-controlled intersections at Little Street and Rothwell Crescent. These devices were intended to reduce vehicle speeds approaching the intersections.

However, site observations indicate that motorists are bypassing the cushions by moving into the opposing traffic lane. This behaviour reduces the effectiveness of the traffic calming treatment and introduces unnecessary safety risks.

Additionally, during rainfall events the existing short cushions create uneven surface transitions between treated and untreated pavement. Vehicles manoeuvring around the cushions in wet conditions increases the likelihood of loss of control, side-swipe conflicts and unsafe head-on interactions.

The current configuration is therefore not achieving the intended speed reduction outcome and presents a safety concern, particularly during wet weather conditions.

What is being proposed?

It is proposed to:

• Remove the existing short single-lane speed cushions.
• Install full-width asphalt speed humps across both traffic lanes at the same locations (prior to Little Street and Rothwell Crescent intersections).

The proposed asphalt hump will extend across the full carriageway width, preventing drivers from bypassing the device by entering the opposing lane.

The hump will incorporate smoother approach and departure gradients to improve ride quality and reduce harsh vertical transitions, making it safer and more predictable for:

• Cyclists
• Motorcyclists
• Micro-mobility users
• General traffic

Appropriate signage and line marking will be installed in accordance with relevant traffic calming guidelines.

Benefits of the proposal

• Eliminate dangerous lane-crossing behaviour used to bypass the existing cushions.
• Improve compliance with speed reduction measures.
• Reduce the risk of head-on and side-swipe crashes.
• Improve safety at the stop-controlled intersections.
• Provide a smoother and more predictable surface for cyclists and motorcyclists.
• Improve safety during rainfall by removing uneven pavement transitions and discouraging evasive manoeuvres.
• Deliver a consistent traffic calming outcome in both travel directions.