T++ V2 may cause two problems.

1. It may be responsible for phantom lanes. Every time I loaded my save game, I had phantom lanes and needed to remove them (using phantom lane remover) in order to be able to build roads.

2. My buses, metros and trains stopped for unusually long times (4-5 seconds) AFTER boarding. Before anyone tells me the obvious, I did try turning off unbunching, disabling IPT and/or AVO but the problems still persisted. The problem is not limited to public transit! I found cargo trains waiting after being loaded, cabs after dropping riders, garbage trucks stopping and blocking lanes AFTER picking up garbage (all ranging from 3-7 seconds).

I disabled Traffic++ V2 and replaced it by TM:PE and loaded the same saved game and voila! No more phantom lanes this time and all my public transport and services were fine.
I tried removing other mods one by one and the problem persists for all except T++V2.