Tourists and residents in Paris face significant metro, RER, and tram service disruptions throughout July and August. Authorities are advising travelers to plan alternative routes to navigate the city during the infrastructure improvements.

Tourists and Parisians alike will have to contend with mass transport disruptions in the French capital and surrounding suburbs this summer due to planned major infrastructure works. Here’s what you need to know to navigate the RER train, metro, Transilien and tram services in July and August and how to plan alternative routes before travelling.