Houston drivers near downtown will have to take alternative routes starting this week as several roads will close for I-45 construction.

TxDOT said the closures were initially scheduled to begin Monday morning but have been pushed to Tuesday morning starting at 9 a.m, ABC13 reported.

Here’s what will be closed:

The Hamilton Street and Gray Street closures will allow TxDOT crews to install storm sewer boxes under Hamilton Street, according to TxDOT. The department said drivers should expect delays.