Traffic heavy on westbound I-70 after accident west of 78th Street Traffic was very slow on I-70 westbound about 5:30 p.m. from about Park Drive west through I-435. According to KC Scout, there was a two-vehicle collision at 4:52 p.m. west of the 78th Street exit on I-70 westbound. (KC Scout photos) Traffic was very slow on I-70 westbound about 5:30 p.m. from about Park Drive west through I-435. According to KC Scout, there was a two-vehicle collision at 4:52 p.m. west of the 78th Street exit on I-70 westbound. (KC Scout photos) Traffic was very slow on I-70 westbound about 5:30 p.m. from about Park Drive west through I-435. According to KC Scout, there was a two-vehicle collision at 4:52 p.m. west of the 78th Street exit on I-70 westbound. (KC Scout photos)