I-70 traffic slows for rollover accident Traffic slowed for a car that rolled over on eastbound I-70 near Mill Street, according to KC Scout. Three lanes were closed because of the accident, which happened about 7:41 a.m. Thursday. Traffic was backed up to 18th Street Expressway. (KC Scout photo) Because of the accident near I-70 and Mill Street, traffic was backed up on I-70 to 18th Street Expressway on Thursday morning. (KC Scout photo)