Cheap Airport O-Bahn

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1NEEDS2POST
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Cheap Airport O-Bahn

Post by 1NEEDS2POST »

Adelaide doesn't have a dedicated public transport corridor from the airport to the city. Fortunately, there is a corridor used for a drain that goes between the airport and Mile End. This drain can fit a cheap O-Bahn that takes buses from the city to the airport, bypassing all of the traffic.

Keswick Creek drain is 5 m wide between the airport and James Congdon Drive. This is plenty of room to fit a single O-Bahn track. Even if the drain needs to be lowered, it's still much cheaper than buying up neighbouring properties or building a tunnel. Because it sits in the drain, the O-Bahn is grade-separated, so it doesn't need to stop for anything. The proposed O-Bahn track is the blue line in this picture.
keswick-creek-drain.png
Buses come from the city on the red line, then enter the O-Bahn in the median on James Congdon Drive. The intersection with Sir Donald Bradman Drive would need to be modified to allow buses to turn onto James Congdon Drive.

If there are no buses on the track, buses can go straight onto the O-Bahn. Otherwise they will have to wait at traffic lights at the entrance to the track.

The drain is only 2.5 km long. Let's say the bus can average 50 km/h in the drain. It will probably be faster than that in reality because it's not stopping. That means it will take 3 minutes to travel the length of the drain. That's fast enough that we don't need passing loops, just have traffic lights at each end. Running these express buses at a ten minute frequency will be easy.

Having a single track bus lane is not a new idea. Here is an example from the USA where they have one bus lane in the median, used for buses travelling in both directions, and it's controlled by traffic lights.



Since it's in a drain, you might be thinking it will flood. That's why this needs to be an O-Bahn and not a normal road. An O-Bahn track can be raised off the bottom of the drain, so that water can flow beneath the track.

In recent years, there has been a lot of work to divert water from this drain to Brown Hill Creek, so it rarely fills up: https://bhkcstormwater.com.au/keswick-c ... iversions/ If it does fill up, so what? Just send the buses along Sir Donald Bradman Drive. That's what's great about the O-Bahn, it can use alternate routes. It's just a bunch of concrete beams, it's not going to hurt if it goes underwater every now and then.

This is so much cheaper than other public transport to the airport ideas and it's fast.
ml69
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Re: Cheap Airport O-Bahn

Post by ml69 »

1NEEDS2POST wrote:
Fri Nov 20, 2020 8:48 am
Adelaide doesn't have a dedicated public transport corridor from the airport to the city. Fortunately, there is a corridor used for a drain that goes between the airport and Mile End. This drain can fit a cheap O-Bahn that takes buses from the city to the airport, bypassing all of the traffic.

Keswick Creek drain is 5 m wide between the airport and James Congdon Drive. This is plenty of room to fit a single O-Bahn track. Even if the drain needs to be lowered, it's still much cheaper than buying up neighbouring properties or building a tunnel. Because it sits in the drain, the O-Bahn is grade-separated, so it doesn't need to stop for anything. The proposed O-Bahn track is the blue line in this picture.

keswick-creek-drain.png

Buses come from the city on the red line, then enter the O-Bahn in the median on James Congdon Drive. The intersection with Sir Donald Bradman Drive would need to be modified to allow buses to turn onto James Congdon Drive.

If there are no buses on the track, buses can go straight onto the O-Bahn. Otherwise they will have to wait at traffic lights at the entrance to the track.

The drain is only 2.5 km long. Let's say the bus can average 50 km/h in the drain. It will probably be faster than that in reality because it's not stopping. That means it will take 3 minutes to travel the length of the drain. That's fast enough that we don't need passing loops, just have traffic lights at each end. Running these express buses at a ten minute frequency will be easy.

Having a single track bus lane is not a new idea. Here is an example from the USA where they have one bus lane in the median, used for buses travelling in both directions, and it's controlled by traffic lights.



Since it's in a drain, you might be thinking it will flood. That's why this needs to be an O-Bahn and not a normal road. An O-Bahn track can be raised off the bottom of the drain, so that water can flow beneath the track.

In recent years, there has been a lot of work to divert water from this drain to Brown Hill Creek, so it rarely fills up: https://bhkcstormwater.com.au/keswick-c ... iversions/ If it does fill up, so what? Just send the buses along Sir Donald Bradman Drive. That's what's great about the O-Bahn, it can use alternate routes. It's just a bunch of concrete beams, it's not going to hurt if it goes underwater every now and then.

This is so much cheaper than other public transport to the airport ideas and it's fast.
I think this idea has great potential. A BRT/Obahn-like system makes a lot more sense than a tram or rail from the western suburbs. And much cheaper.

I have always thought that a multi-storey park n ride and Obahn bus interchange at the corner of SDB Drive and May Tce could work as effectively and be as popular as the Paradise Interchange. This would serve suburbs such as West Beach, Lockleys, Henley Beach, Findon, Fulham Gardens etc.

From this ‘Airport’ interchange, you would also have a bus stop near the new hotel to pickup airport passengers, and then express into the city along 1NEEDS2POST‘s Obahn route.

Some buses will terminate at this interchange, while others will continue to West Beach, Henley Beach or wherever.

It would be a short 10-12 min bus trip in the peak to get to Grote St.

Makes sense (to me) and it won’t cost a fortune. But it’ll never happen because this government has no vision.
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Ho Really
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Re: Cheap Airport O-Bahn

Post by Ho Really »

1NEEDS2POST not sure if you received a private message sent to you back on November 22, 2020. Did some quick concept drawings (cross sections) of light rail to the airport using the Keswick Creek drain, which I've been advocating for many years. This would fit into a wider metro plan of rail upgrades. If you didn't receive them I can send them again. Anyhow an O-Bahn option is never out of the question but since you'd need to lay down a concrete guide track why not make it light rail?

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PeFe
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Re: Cheap Airport O-Bahn

Post by PeFe »

I regularly catch the bus to Adelaide Airport if I am flying interstate and each time I make a mental note of the passenger load.

I never have seen any numbers justifying an O-Bahn or even a tram......no wonder the J1X express bus was cancelled. The J1 and J2 are really just local buses that traverse the airport and this works just fine.

Given the Covid situation I don't see any real passenger increase for at least 10 years in order to justify an upgrade of airport public transport
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