1) HOV Lanes
HOV lanes are a must in large cities, and they often switch directions
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Barrier to Entry: High. It would be a nightmare to make traffic actually switch according to day. Then again, with the STR (Single Track Railroad) it might not be so difficult.
2) Power lines over GLR lines
Come on, where was the last time you saw a light rail without power lines over them?
Barrier to Entry: Low. All it takes is a cheap model and mild skill.
3) Stoplights that Face the Right Way
Do these look wrong to you?. Yes. Most real stoplights look to the cars from the inside of the stoplight square, not to the out. The one exception is this intersection, Valley Mills and Memorial, Waco, Texas. But as you notice, the "wrong way stoplight" is a special instance, not a normality. Sorry, SimCity, you fail!
Barrier to Entry: High. It may be hard-wired.
4) Continuous flow intersections
It's too cool to be expressed in my words.
Barrier to Entry: High. If pulled off, that would be the end-all of road coolness.
5) Nice-looking RHW-Avenue Crossings
A picture would really help here, but RHW currently does not have a good Avenue-to-RHW crossing texture!
Barrier to Entry: Low. It takes but a texture.
6) Businesses and residential along RHW
With SimCity 4's third-party add-ons I can finally create that lovely strip of highway between Hempstead and Navasota...rolling hills, lots of wildflowers, the farm houses, the watermelon stands...wait, scratch that. Unfortunately, RHW won't let you place RCI (or anything) on RHW. Well, you CAN, but it won't function. Drat.
Barrier to Entry: Medium. RHW can be recoded to allow RCI, but if you wanted to make an Interstate-style set-up, you still can...just don't place anything along it!
7) Puzzle Piece Neighbor Crossings
Currently, Streets, RHW, and GLR cannot cross neighbor crossings, which leads to an unrealistic replacement. All there needs to be is a puzzle piece to fill in the gap.
Barrier to Entry: Medium. It could be done.
8) Park & Ride Equality
Suppose you've got two SimCity cities: a suburb and a huge city. Most of the suburban residents go to the city for work. You've got a nice RHW for them, a park & ride for buses, and a commuter rail. Sims will take the highway, leaving your bus and railroad to gather dust and eat up funds. Desperate, you install the Park & Ride mod, and suddenly, RHW traffic drops off. Why can't everyone get along? People take Park & Rides AND the highways in REAL LIFE.
Barrier to Entry: High. Two traffic simulators do not make a stable game.
9) Ploppable road left turns
You can get a mod that adds a left turn for roads when they approach an intersection, but when it does it to every intersection, it's not realistic. It should be ploppable, so that some intersections have it, others don't.
Barrier to Entry: High. Although it could be possible, most people will find it irritating.
10) Integration with the RAM
More puzzle pieces, like, say, Avenue over STR.
Barrier to Entry: Medium. It's entirely possible, but would take lots of time.
