Rosewater LATM Scheme (North of Grand Junction Rd)

Since our letter to Rosewater Community – North of Grand Junction Road in March 2016 seeking feedback regarding traffic issues in your street and the study area, Council and our traffic consultants (SMEC & Cirqa), in conjunction with a Community Reference Group have developed a proposed LATM Scheme. The Community Reference Group consists of six residents from different streets in the study area.

The scheme that has been developed considered the following:

  • feedback from the residents, property and business owners
  • traffic data and field investigation/observations
  • Feedback from other relevant stakeholders such as Department of Planning, Transport and Infrastructure (DPTI)

Rosewater Community –North of Grand Junction Road and Port Adelaide Bicycle User Group are invited to provide feedback on the proposed LATM devices by completing and returning the enclosed questionnaire in the reply paid envelope or by emailing The closing date for comments is Monday 5 December 2016. Please complete one questionnaire per household. All representations will be considered by the Project Team.

Council staff, SMEC and the Community Reference Group will then review the community feedback and present a final LATM Scheme to Council’s Elected Members for consideration and endorsement through the Ordinary Council Meetings. After final endorsement by Council, residents will be notified of the final LATM Scheme and localised consultation will be undertaken with the adjacent properties as part of the detailed design process.


Treatment Options

There are a number of traditional traffic management treatments that can be used to provide an area wide traffic management plan.

Different devices are targeted to address different issues, however there is no one 'silver bullet' which is 100% effective in addressing an issue, and most will have benefits and dis-benefits for differing types of road users. The intention is to influence behaviours (particularly driver behaviour) to produce safer road environments in these local residential areas.

The following provides a brief explanation of the various treatment types that the study team has considered in developing the Rosewater LATM plan.

In South Australia, all traffic control devices must comply with the Manual of Legal Responsibilities and Technical Requirements for Traffic Control Devices: Part 2 – Code of Technical Requirements (“The Code”), as well as relevant Australian Standards and Austroads’ Guidelines.

LATM devices shall accommodate the needs of pedestrians and cyclists, with cyclist bypasses provided where appropriate.

Kerb Protuberances (Kerb Extension with on-street car parking provision)

Kerb protuberances are extensions to the existing kerb and water table along each side of the road. Kerb protuberances are generally installed at road intersections, and provide the following benefits:

  • Provide both a physical and visual impression of a narrower road carriageway, which in turn reduces vehicle speeds along the continuing road;
  • Provide a location to install pedestrian ramps which are located such that pedestrians can generally see beyond any adjacent parked vehicles, providing clearer sight lines to vehicles travelling along the road;
  • Enables the side road traffic to be positioned in to the continuing road carriageway, improving lines of sight in both directions, and particularly beyond parked vehicles.

Consideration will be given to the position of the kerb protuberance in relation to the through land width, while still enabling cyclists relatively unimpeded travel along a road, without the need to move into the through lane. This is especially important on higher trafficked roads, where cyclist would find it difficult to merge into the through traffic stream.

Contrasting Pavement

Contrasting pavement is another method used to indicate to drivers that they are entering a different road environment. It is one of the simpler treatments to install, particularly as it is at the existing road levels, and so there is no impact on drainage and bicycle in comparision to some of the other treatments. Contrasting Pavement provides the following benefits:

  • Reduction in approach speeds to an intersection
  • They highlight the presence of an intersection/link
  • Provision of separation between residential areas from areas of non-residential use
  • They alert the driver that they are entering a local area

Modified T-Junction

Modified T-Junctions are used to affect a change in the vehicle travel path thereby slowing traffic via deflection of traffic movements and/or reassignment of priority. They act in a similar manner to slow points in moderating traffic speeds but at a three-way intersection. When used in series they can provide effective speed control down the length of a street. When used to change priority, the terminating leg of the intersection is connected to one 90 degree intersection leg to become the new priority carriageway. Modified T-Junctions provide the following benefits:

  • Controlling of traffic movement and improvement in traffic flow
  • A reduction in vehicle speeds at the treatment
  • Facilitation of safe pedestrian crossing
  • Reduction in vehicle conflict points
  • When placed in series can lower vehicle speeds along the length of the street

Flat Top Road Hump

A Flat Top Road Hump is a reaised surface approximately 75~100mm high and typically with a 2 to 6m long platform ramped up from the normal level of the street. Flat Top Road Humps with ramp gradients of 1:15 to 1:20 are generally regarded as bicycle friendly. Flat Top Road Humps provide the following benefits:

  • A signifiant reduction in vehicle speeds in the vicinity of the device
  • A significant reduction in road crashes
  • Their relatively low cost to install and maintain
  • They discourage through traffic
  • When used in a series they regulate speeds over the entire length of the street
For further information on this topic, or if you have any questions, please call our helpful Customer Services team on 8405 6600 or email us at
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