There are some classic road dangers well known to all experienced cyclists. Parallel drains are one of them. Tell your local council, and they will probably change them.
Other well known dangers include slippery wet leaves, black ice in the shade of a tree on a bright winters day, pot holes full of water that are deeper than you think, lack of grit/salt on a bike lane, raised curb where a bike is supposed to join a bike path, metal sewerage system covers which get slippery when wet, raised paint road markings which you have to ride across, the first rain after a long dry spell making the road very slick.
The road is no place to play, and remember, you're not being paranoid; THEY really are out to get you.