Welcome to the development topic for my version of an NRT roadset.
Attachment:
Chindham Transport, Sep 22nd, 1990.png [ 68.56 KiB | Viewed 3880 times ]
(note: dirt, sett, and european roads not pictured!)RattRoads is essentially the successor to ARRS, featuring revamped sprites and (currently) 5 additional roadtypes to take advantage of some of NRT's features. All six road types are compatible to each other and the default ROAD type so any vehicles can drive on them.
Basic Asphalt Road [ROAD] - Introduced in 1920, this is the roadtype towns will build by default. Nothing more than a strip of pavement, it is cheap and only has a speed limit of 40mph. Note that because this roadtype is the default, it will always be available, even before 1920.
Improved Asphalt Road [ASP1] - Boasting improved safety features, such as a yellow line painted on the surface, this roadtype is introduced in 1940 and has a speed limit of 55mph
Modern Asphalt Road [ASP2] - This roadtype is introduced in 1970 and includes paved shoulders and fog lines, allowing a higher speed limit of 85mph.
Highway [HWAY] - Introduced in 1955, the Highway roadtype has no speed limit, but is very expensive. Eventually I will include a set of objects to augment highways similar to the way I tried to in
ARRS Objects, but they are not included yet. As of 0.2.0, houses will no longer try to build along highways!
Dirt Road [DIRT] - Everyone's favorite bumpy, dusty, dirt roads make a return for RattRoads featuring a
shiny dirty new look. These roads are available from year 0 and due to being
even less safe than their paved cousins only have a speed limit of 25mph.
Sett Paved Road [SETT] - New in 0.3.0! Also available from year 0, these roads offer a paved alternative to the muddy, bumpy roads of the old days. Made with sett stones, they offer only a slight increase in speed to 30mph, but they look especially appropriate inside old towns.
What's that? You don't want
any speed limits? You want them
slower? You want to build Highways in 1700? Perfect, because since version 0.2.0, RattRoads now has parameters to allow you to configure all of those things as you please! And as a bonus for our European friends, there's now also a Euro/UK road surface alternative which can be activated by parameter (default is still American style), as well as an available French translation!
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Please mind that this roadset is not 100% complete, especially due to the ongoing development of NotRoadTypes itself.
*cough*don't build tunnels*cough* 
As new features are added the set will need to be updated too, and there are a few things I still need to polish, but otherwise it's functional and is a good representation of what the set will be.
Similar to ARRS, RattRoads is made to work with OpenGFX, including full support for OpenGFX+ Landscape. Let me know of any problems with the set, and if you encounter any crashes or similar please
let the NRT guys know so it can get fixed.
Remember, the more you play with NRT and find bugs the better odds of getting this in trunk
Naturally this NewGRF requires the
RATT fork of OpenTTD, and is released under GPL v2 license. Huge thanks to the team behind NRT and OpenTTD itself for making this possible!
Enjoy!
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They could also be used for those unavoidable "Road Under Construction" zones that make us late for appointments and where we get ticketed and fined for not slowing down. 
I just noticed they are on your to-do list.
) (Route sans péages?). The usual configuration is multi-lane but OTTD does not support multi-lane. A player must build two or more two lane roads in parallel while using the one-way feature to control direction. Road stops can be used to mimic toll booths.