To implement a tidal flow traffic scheme in Drummoyne, some changes would be made to the existing median. There are several different options to implement the tidal flow.
Electronic - such as using lights in the pavements or on overhead gantries to show the current lane configuration. Such schemes would operate from the RTA’s Transport Management Centre.
Manual systems – these use traffic control devices such as candy bars, barriers, and moveable medians such as the "zipper" with additional signage.
A combination of electronic and manual systems could be used to implement the tidal flow. One recent innovation in moveable medians is the "zipper", which uses a special purpose vehicle to move the 80cm high median barrier into place.
What safety benefits would this system provide?
The implementation of a moveable median barrier provides:
Improved safety for pedestrians by discouraging unsafe crossings.
Improved safety for motorists by preventing vehicles from crossing into opposing lanes of traffic.
Improved safety by preventing vehicles from turning right into or out of driveways.
How would the moveable median barrier be placed into position?
A purpose built vehicle picks up the barrier on one side of the vehicle and using a series of rubber rollers (beneath the vehicle) transfers it to the other side. As the vehicle progresses, it places the barrier back onto the road in its alternate position. Click here to view a video of a similar vehicle moving a median barrier in traffic.
Where would the moveable median barrier be used?
The moveable median barrier would be in use between Seymour Street, Drummoyne and Iron Cove Bridge. Access will be maintained at existing intersections and pedestrian crossings with the exception of Cary Street in the AM peak period.
What will the moveable median barrier consist of?
Moveable barriers are short sections of high strength, reinforced concrete blocks that are pinned together to form a continuous wall. They are approximately 80cm high, 60cm wide at the base and 94cm long.
How long will it take to move the median barrier?
The special purpose vehicle would take approximately 10 to 20 minutes to move the barrier from one lane to the other.
How much noise will be generated by the special purpose vehicle moving the barrier?
Noise levels generated by the vehicle would be addressed in the environmental assessment. Appropriate mitigation and management measures would also be identified as part of the assessment and implemented into the project.
Where would the special purpose vehicle be stored?
The special purpose vehicle would be stored at an appropriate off-site RTA depot nearby.
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