We're currently building a new terrain and have noticed the icons showing objects on the map are not accurate, see screen shots below :

Map in game shows several buildings blocking the road http://i.imgur.com/Lh3oXlp.jpg
In game they are not blocking the road as the map showed http://i.imgur.com/5Knfpdl.jpg

These are default vanilla objects, some seem worse than others, the 'Car Service' for example is way out but 'Stone House, small, brown' is perfect and accurate.