Advanced Roundabout

From OpenTTD

Railway junctions 3-Way junctions Basic 3-Way Line Merge Half Cloverleaf Half Spaghetti Compact 3-Way Compact 3-Way B-M Junction Ultimate 3-way 4-Way junctions Basic 4-Way Roundabout Cloverleaf Spaghetti Star Complex Star Branch-Merge Over-Under Tetrathorp Pre-Signaled Roundabout Advanced Roundabout Right-of-way Roundabout Enormous junctions Double Cloverleaf Dual Tetrathorp Dual Branch-Merge Quad Branch-Merge 8-Way Star Other junctions Right-of-way Depot Dual tunnels Right-of-way Lane Change Unuseful juctions Crossover 3/4ths junction Ultimate 3-way junction for 4 tracks

Unlike the basic roundabout, this junction has 1 level above the default Track-Level. Trains can pass straight through and turn right without entering the circle.

Some problems are minimized by using pre-signals

Pros:

• Can handle lots of trains moving N-E or S-W
• Tracks split and only trains going to the left need to take the round-a-bout
• Full speed for straight and right-turning trains

Cons:

• Gridlock possible.
• Longer trains (3 tiles +) have to slow down for left-turns
• Costly to build.
• Trains moving N-W or S-E (and also trains turning left) must slow down to climb a slope.

Optional construction tips:

• To allow left-turning trains traveling at full speed through the roundabout, its possible to enlarge the circle, but this takes a lot of space to build.