WarlockLord: So all this time I've been doing Civ-style "a road for every tile!" building for nothing? Good to know. Is there a limit to how many link-to-other-city bonuses you can get?
Sadly yes it was not helping beyond any extra after connecting towns.
TIP - Endurance Life Spell really speeds up road building when cast on Engineers. Not just the obvious bonus of perhaps being allowed to build same turn you move but it actually DOUBLES your effectiveness (Dwarfs only get +50% to this). For a quick example on a River or Nature Node Tile it normally takes 5 turns to build a road. With Endurance that same engineer will only take 2 turns.
Dwarf Engineers are so super as they work twice as fast as any others. Basically 1 Dwarf = 2 of any other engineer. With Endurance on the Dwarf he = 3 normal engineers. 2 Enduranced Dwarfs can build a road on any legal tile in 1 turn.
Also a group of 5 normal non buffed engineers can build a road in 1 turn as well. Problem is their darned upkeep. Esp compared to Dwarfs.
For much more detailed info on any more questions re road building check out the wikia page below.
http://masterofmagic.wikia.com/wiki/Roads