Congestion locale is a French term that refers to traffic congestion in a localized area. It is often caused by an increase in the number of vehicles on the road, or by an obstruction such as a construction project. The term can also refer to a situation where the flow of traffic is restricted due to a lack of infrastructure. The crossword solution for this term is 'SINUS', which is a Latin word meaning 'CURVE' or 'BEND'. This is likely referring to the curves and bends in roads that can cause traffic to slow down or become congested.