2- 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.
3- Crossing a river or chasm often depicts death, not necessarily a physical death but possibly spiritual change. [2]
A new beginning or fresh start.
Crossing a large area (such as a desert) can represent making progress through a phase or process.
An illegal or unpermitted crossing (such as a property line or international border) can represent a feeling or fear of doing something wrong, “crossing a line,” or getting caught.
See also: Road, Bridge, Crossroads, Entering, Invading, Crime [3]
(2) Crossing the sea, going from one country to another, may symbolize a fundamental personal re-orientation; perhaps leaving conventional values behind in favour of values discovered within oneself.
(3) Even crossing the street may have similar significance. Pay attention also to the direction: are you crossing from left to right, or from right to left? See also Left, Right / Left. [4]
If crossing a street, the obstacle is a social one. But if it is a natural barrier, the problem will likely be internal. [6]