If you are planning on traveling east on Interstate 270 tonight you may need to adjust your route. The Illinois Department of Transportation has announced a nighttime lane closure on eastbound I-270 between the Chain of Rocks Canal Bridge and Mississippi River Bridge tonight starting at 9 p.m., weather permitting. The closure is needed to make modifications to the Intelligent Traffic Systems installed along the roadway according to IDOT officials. During the closure, traffic will be guided through the work zone utilizing flaggers and other devices. The roadway is expected to reopen by 5 a.m. on Tuesday.