Laying out a city using the Lego road plates has some big limitations. The largest limitation, obviously, is how much ROOM you have to put the town in and whether or not it can all be in one place or on one level. These pictures were all taken during the planning stages of the original floor-based town (not the table version we have now). The second biggest limitation is WHAT plates you have. We have a wide array of plates from the "glory" years of Lego's town theme but they can still be hard to assemble into a useful town. It isn't enough to just connect the street ends, you want the town to have some logical flow to it and have main streets and side streets.
The red barriers represent gates or obstructed streets. The ones in this plan separate the airport property from the rest of town. The police and fire departments' plates are also marked because they can't be used as thru-streets. Plates with green lugs are noted so they are used for runways and neighborhood areas.
This plan has a nice downtown area with two matching 3 plate blocks. Getting a lot of abutting building space is critical if you want to have buildings that are larger and more complex-- you can "steal" building space from the adjoining plates (not to mention parking areas).
This plan has a major flaw in that the building spaces are too small except for the one large loop.
Two gates are in this plan. The one on the left keeps the dock area secure and the one on the right is for the airport property. The major flaw here was the combination of all those curve in one place-- the center area was too small for anything to be built on.
There is a lot of building space in this plan. The curve pieces combined with adjoining straight plates to make for large construction projects. The only real flaw here is that the emergency services are all clustered over by the airport so that a single accident could isolate the town.
I just didn't like this plan. The street between the police and fire departments is just lost space as is the random street by the neighborhood entrance.