Abstract: The differential settlement between the existing and new embankment is the critical topic in highway widening projects. Excessive differential settlement will lead to the failure of the highway subgrade, settlements and cracks in the pavements. These defects can severely affect the performance of the pavement and reduce the service life of the pavements. This paper discusses five (5) common hazards in the highway embankment widening projects and their causes.

Key words:  Highway Widening Projects, Embankment Subgrades, Common Hazards, Hazard Mechanism, Transition Zone