Upon all roadways of sufficient width a vehicle shall be driven upon the right half of the roadway, except as follows:
1. When overtaking and passing another vehicle proceeding in the same direction under the rules governing such movement;
2. When the right half of a roadway is closed to traffic while under construction or repair;
3. Upon a roadway divided into three marked lanes for traffic under the rules applicable thereon; or
4. Upon a roadway designated and signposted for one-way traffic.