NAM36 Tutorial: RHW-4 U-Turns

Sometimes sims need to do a U-Turn on the highway.  This is particularly troublesome if their work and home is close, as the crow flies, but the great big highway is in the way, requiring that they take a very long circuitous route to get to the other side of the highway.  That's the sort of thing that can lead to residential buildings being abandoned.

The ability to do a U-Turn fixes that, with sims jumping on the highway, and using the U-Turn to switch directions ASAP and jump off the highway on the other side.

There's four efficient and realistic ways to implement a U-Turn on RHW-4 highways ...

1. The next interchange up the highway.  This is the one we're all used to from Maxis vanilla highways (MHW).  Most interchanges provide the ability to do a U-Turn ... but some don't, and sometimes the next interchange is too far away, so it's good to have some other options.  A simple little compact diamond interchange, like this one, is a very effective way to accommodate U-turns.
           
    
2. Draw across the two carriageways of RHW-4 using the Street tool (Alt+R key).   This looks rather like an emergency vehicle turning lane ... and I presume commuters can use these, too, when they need to?
           
    
3. Draw across the two carriageways of RHW-4 using the Road tool (R key).   This looks like a higher traffic volume solution than Street (above), but I don't know whether this causes traffic congestion problems like at-grade highway intersections usually do?
           
    
4. A FLUPs RHW-4 U-Turn, using a FLUPs underpass, with FLUPs ramps descending and ascending parallel and adjacent to the highway.
           
    

Above options 2 and 3 are cheap, easy and effective.  Whether they are effective in high volumes of traffic is something I haven't tested yet, which led me to come up with option 4.  Follow this post if you'd like to know about traffic congestion, as I'll post back here in the comments when I find out.  Further explanation on option 4 follows ...

Option 4 – The FLUPs RHW-4 U-Turn

This needs a minimum of 8 tiles adjacent each side of the highway, so while smaller than an interchange, it ain't small!  Here's the ingredients list:

1. FLUPs one-way road ramps, these are found on the  FLUPs  menu item, just rotate the FLUP road ramp (with Home/End keys), until it turns into a one-way road ramp ... make sure the arrows are pointing in the right direction!  Here's an excellent video tutorial on FLUPs from @rsc204, if FLUPs are new to you.
   https://youtu.be/HpLGtqjjE8A?t=334
    
2. Type A1 outside ramps.  Here's a link to a tutorial on creating those with DRI.
   https://community.simtropolis.com/journals/entry/29111-nam36-tutorial-starting-out-with-basic-rhw-highway-ramps-dri/
    
3. Diagonal underground route under Pedmall (shown in screenshot below).  These are under the  FLUPs  menu item (framed with a red square below), but you have to use the Tab key many times to reach this piece, and then rotate with Home/End keys many times to get to the right shape and type.
    
4. Straight underground route perpendicular under straight RHW4 (shown in screenshot below).  This is a special FLUPs piece that is NOT under the FLUPs menu item ... instead you'll find it under the  RHW/RD  menu item (also framed with a red square in the screenshot below), the Shift+Tab three times to reach the "under straight RHW-MIS" piece, than rotate using Home/End keys until the "under straight RHW4" piece appears.

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  See the full catalog of my NAM tutorial posts linked in the comments under this other Simtropolis post of mine ...
    NAM36: Starting Out advice for newcomers  

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PS.  Really can't recommend this video tutorial highly enough.  If you still have more to learn about FLUPs, and you haven't seen this yet, it's really, really good.

Using FLUPs
https://youtu.be/HpLGtqjjE8A?t=334
NAM Tutorial Part 3a (starting at 5:43 minutes)
on the MGB NAM channel