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Uninformed guess; reduce the width of the median strip and convert the bike/emergency lanes, provides for a 3rd land on each side?aceman wrote:doesn't gallipoli underpass need to be widened?
The Gallipoli underpass is about 20m wide and the T2T motorway is about 25m wideVasco wrote:Uninformed guess; reduce the width of the median strip and convert the bike/emergency lanes, provides for a 3rd land on each side?aceman wrote:doesn't gallipoli underpass need to be widened?
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Has it been stated anywhere that the whole motorway is going to be one consistent width? Tunnel proposal renders show only 2 lanes in one direction. Southern expressway chops and changes between differing numbers of lanes etc.Mr Messy wrote:The Gallipoli underpass is about 20m wide and the T2T motorway is about 25m wideVasco wrote:Uninformed guess; reduce the width of the median strip and convert the bike/emergency lanes, provides for a 3rd land on each side?aceman wrote:doesn't gallipoli underpass need to be widened?
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I thought it had been described as three lanes all the way. That is clearly a bit of a loose description as northbound on the Superway narrows to two lanes above Grand Junction Road, then returns to three lanes by adding the on-ramp. Something similar could easily be done at Anzac Highway which will clearly become a major exit for northbound commuter traffic, with "left lane must exit" before the underpass rather than just a squeeze.Vasco wrote: ↑Sat Mar 09, 2019 9:20 pmHas it been stated anywhere that the whole motorway is going to be one consistent width? Tunnel proposal renders show only 2 lanes in one direction. Southern expressway chops and changes between differing numbers of lanes etc.Mr Messy wrote:The Gallipoli underpass is about 20m wide and the T2T motorway is about 25m wideVasco wrote:
Uninformed guess; reduce the width of the median strip and convert the bike/emergency lanes, provides for a 3rd land on each side?
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I'm only an irregular user, but I've never noticed an issue with the narrowing before the Grand Junction on-ramp. Issues at the moment come from the further tightening to get to Salisbury Highway, so it could well become an issue later once the Northern Connector is open. Alternatively, perhaps it is better to merge three flowing lanes to two than it is to merge the on-ramp into three continuing lanes. Does anyone know where to find international/national standards for building freeway interchanges? It's likely that someone, somewhere has done research and recommendations for how to manage traffic near on and off ramps to minimise collisions, near-misses and congestion (and I'm happy for safety to rank above convenience if they conflict).
I think they'd be anticipating most of the southbound truck traffic to exit the North South Motorway at the PRexy or Grand Junction roadclaybro wrote: ↑Sun Mar 10, 2019 5:53 pmAlso I am obviously an infrequent user, however I would suggest the reason the narrowing of the superway to 2 lanes at GJR is not causing issues at present is because it is rarely very busy now. Things will change dramatically when it connects on to the Northern connector, and I reckon this pinch point will become a real issue with trucks slowing and trying to merge at this spot.
Elevated structure (North of Edward Street to South of Daws Road)
- This area is predominantly industrial/commercial and includes known contaminated soils that would
require expensive remediation/disposal if disturbed;
- Lots of side road connections including East-West movements that service local area and facilities
that do not need to interact onto the N-S Corridor;
26
- Minimal loss to visual amenity due to duplicating the existing elevated roadway over the rail corridor
at Cross Road;
- Shallow groundwater along this road section leading to ongoing maintenance effort if an alternative
treatment was selected;
- Greater flexibility for future rail/road separation as part of Emerson crossing upgrade.
It's travelling north that will be the problem. 2 lanes will most definitely cause a bottleneck when the rest of it is 3 Lanes leading up to that point. I would hate to see them repeat this potential problem at Emerson.Goodsy wrote: ↑Sun Mar 10, 2019 6:14 pmI think they'd be anticipating most of the southbound truck traffic to exit the North South Motorway at the PRexy or Grand Junction roadclaybro wrote: ↑Sun Mar 10, 2019 5:53 pmAlso I am obviously an infrequent user, however I would suggest the reason the narrowing of the superway to 2 lanes at GJR is not causing issues at present is because it is rarely very busy now. Things will change dramatically when it connects on to the Northern connector, and I reckon this pinch point will become a real issue with trucks slowing and trying to merge at this spot.
The actual road is wide enough to accommodate 3 lanes, it’s just that it’s painted as 2 lanes at the moment.claybro wrote: ↑Sun Mar 10, 2019 6:59 pmIt's travelling north that will be the problem. 2 lanes will most definitely cause a bottleneck when the rest of it is 3 Lanes leading up to that point. I would hate to see them repeat this potential problem at Emerson.Goodsy wrote: ↑Sun Mar 10, 2019 6:14 pmclaybro wrote: ↑Sun Mar 10, 2019 5:53 pmAlso I am obviously an infrequent user, however I would suggest the reason the narrowing of the superway to 2 lanes at GJR is not causing issues at present is because it is rarely very busy now. Things will change dramatically when it connects on to the Northern connector, and I reckon this pinch point will become a real issue with trucks slowing and trying to merge at this spot.
I think they'd be anticipating most of the southbound truck traffic to exit the North South Motorway at the PRexy or Grand Junction road
Someone said the Gallipoli Underpass is 3 metres narrower than the T2T trench, hence the assumption that one direction will need to be only two lanes.Bacon wrote: ↑Sun Mar 10, 2019 7:07 pmThe actual road is wide enough to accommodate 3 lanes, it’s just that it’s painted as 2 lanes at the moment.