Crossing a river or chasm often depicts death. This is not necessarily a physical death but possibly spiritual change of some kind.
Psychological / Emotional Perspective:
We may encounter something we cannot control, and which may control us. To be crossing a field shows we could have a false sense of security, or may need to bring our feelings out into the open.
Everyday Material Aspects:
To dream of crossing a road is recognizing the possibility of danger, fear or uncertainty. We are perhaps pitting ourselves against something that is bigger than us. Crossing someone suggests getting on the wrong side of them.