But not as willi-nilly hoping to slow drivers down whenthere is no reason to slow down.
There is a system to that:
1. Center line: This is your lane. The road is wide enough for at least one lane for each direction. Everyone stays in his lane and nothing happens. No overtaking
2. Broken center line: same as above, but may use adjacent lane for overtaking
3. No line: Road may or may not be wide enough to pass oncoming traffic safely. Pay attention, keep to the right and use common sense
4. Double line: multiple lanes for at least one direction available. The lane on the other site is NOT your direction. Imagine this as a guiding rail and never ever cross.
If you now simply remove lines, this information is lost.
And this is even completly ignoring the fact that different speed limits (read: suggested maximum speed) require special lane markings.