What is the function of internal baffles / surge bulkheads (mamparas rompeolas) inside a liquid cargo tanker?

1. To separate different types of chemical products inside the same compartment
2. To restrict longitudinal (front-to-back) liquid movement during acceleration and braking, reducing dynamic surge impact on the tractor
3. To heat the liquid during winter transport
4. To eliminate the need for tanker tie-down straps