You do need to work on those errors/warnings. 

In this area JOSM validator reports some 16 errors and 121 warnings... 

Errors (16)
Duplicated ways (1)
Highway duplicated nodes (10)
Multipolygon is not closed (1)
Multipolygon ring contains segment twice (3)
Overlapping highways (1)
Warnings (121)
area on a relation (1)
Crossing building/highway (7)
Crossing highways (60)
highway=footway together with foot=no (1)
highway=footway together with maxspeed=40 (1)
missing tag - man_made=tower without tower:type (1)
Mixed type duplicated nodes (23)
node connects highway and building (3)
Route scheme is unspecified. Add public_transport:version (2=public_transport; 1=legacy) (1)
Self-intersecting polygon ring (1)
Unconnected nodes without physical tags - No tags (2)
Unnamed ways (12)
Way end node near other highway (8)