Truck City : Update notes for v1.1.5

Update notes for v1.1.5

Truck City v1.1.5 has just been released. This changelog also includes changes made in v1.1.4:

• Improvement: performance improvement on research center lighting. The previous method may cause severe framerate drops on very big (hundreds of production buildings) research centers
• Improvement: one-way roads directionality algorithm improved
• Improvement: factory information tooltip text minor improvements
• Bugfix: copy-pastig one-way road blueprints may cause the wrong tile to be pasted