Work officially began overnight on the third and final phase of the Kennedy Expressway rehabilitation project — and major traffic backups were already causing headaches during the Tuesday morning rush.

Construction officially began overnight on the third and final phase of the Kennedy Expressway rehabilitation project — and major traffic backups were already causing headaches during the Tuesday morning rush.

The inbound reversible express lanes will become exclusively outbound Tuesday morning, just two months after they reopened following a year of improvements. Two outbound lanes will also close.