Yes, it’s double track junctions that we have been campaigning for; they are a common feature of railways all over the planet. Their most important feature is that they save space in restricted situations. (See Perchpole’s pic above.)
Flyovers are very good in separating conflicting traffic flows but the downside is they cost lots of money, and most of all they take a lot of space.
The lack of this type of junction betrays a lack of basic railway knowledge by the developers.