The world of transport and road design has moved on, for the better, but still we need good roads. That I55 project is quite interesting (and GE shows it now under construction). Yes, it is an example of clearer thinking now, and it correctly concentrates on I55 freeflow. However, the USA's current roundabout love-affair may be leading them astray. The 2015 roundabout design was perhaps just about OK. The 2024 one is single lane and very small. It's not going to cope, even with those local roads. They should stick to their tradition: a signalised cross (and join that 5th arm local road in somewhere else).Bryn666 wrote: ↑Mon Apr 15, 2024 12:56 But this is the point, the A201 is not a lengthy grade separated road - you have a turbine serving a road that turns into a city street less than 2 miles to the west, so it gains very little for the network other than a huge maintenance cost. It's some of the oldest motorway infrastructure in Belgium, built at a time when cars were king and nothing else mattered - the world has moved on, whether people on SABRE like it or not. Even the USA is rethinking giant free-flow interchanges where they are expensive to maintain and not helpful to traffic - a current example being this:
https://www.memphisflyer.com/whatever-h ... nterchange
You could argue they should've replaced the cloverleaf with a turbine or a stack but they've gone with the critical movements only - I-55. Much like how the SPUI is going with the critical movements - the R0; which loses a lot of diverge/merge problems and has a clearer run through meaning capacity and safety improves whilst not inducing loads of extra car traffic to an airport Jackal has already conceded has excellent non-car provision to.
Analogous to R201: not really close. Those other roads in Memphis are very local and (I presume) low volume, and you wouldn't dream of putting a turbine or stack there. A cloverleaf was of course typical 1960's misguided thinking.
But you're right that we can dismantle some 1960's mistakes. In Canberra, AU, one of the key interchanges from the earliest constructions is being cut back, and (you'll love this Bryn) it's to enable stage 2 of the city's light rail system. London Circuit's links to two clover-leaf loops that connect to Parkes Way are being removed, and a signalised crossroads (also accommodating a tram turn) is replacing them. I approve.
https://www.google.com.au/maps/place/Ca ... ?entry=ttu
But I do now agree with Jackal on Brussels' R201!
(Edit: G.maps Canberra link added)
