Miss. Code Ann. § 63-3-601: Miss. Code Ann. § 63-3-601

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.