What does the term Causeway mean in grid square 4723?

1. It is a road across a river
2. A raised platform across a stream
3. It is a cart
4. It is a stream

In grid square 6827, the double dotted line means

1. A road in the forest
2. A clearing made in the forest to prevent spread of fire called fire line.
3. An unmetalled road to cross the forest
4. Clearing the forest for farming purpose

The broken line in red in grid square 6812 and 6913 indicates

1. A cart track
2. A footpath
3. A pack track
4. A road

What does the number 158 in the grid square 2189 indicate?

1. A spot height of 158 m
2. Height of the surveyed tree above sea level is 158 m
3. A prominent survey point shown as surveyed tree at the height of 158 m above sea level
4. Surveyors mark is 158