Photo taken on Tuesday, May 12 showed queues building in both directions on Brighton Road, where two-way signals are controlling traffic.
A259 is affected both ways near the worksite, with congestion expected throughout the duration of the scheme.
According to AA Traffic News, the disruption is linked to gas main works and temporary traffic signals, with delays likely for drivers passing through the area.
One.Network lists the company carrying out the works as Scottish Gas Networks (SGN).
The works began on May 11 and are scheduled to continue until May 18.
Traffic management is in place using two-way temporary signals while engineers carry out the repairs.
Drivers are being advised to allow extra time for journeys and consider alternative routes where possible.

1. Delays on A259 in Lancing as gas works cause traffic queues
Photo taken on Tuesday, May 12 showed queues building in both directions on Brighton Road, where two-way signals are controlling traffic. Photo: Sussex News and Pictures

2. Delays on A259 in Lancing as gas works cause traffic queues
Photo taken on Tuesday, May 12 showed queues building in both directions on Brighton Road, where two-way signals are controlling traffic. Photo: Sussex News and Pictures

3. Delays on A259 in Lancing as gas works cause traffic queues
Photo taken on Tuesday, May 12 showed queues building in both directions on Brighton Road, where two-way signals are controlling traffic. Photo: Sussex News and Pictures
