Debris slows I-35 traffic Express-News Copyright 2013 Express-News. All rights reserved. This material may not be published, broadcast, rewritten or redistributed. Published 8:20 am, Wednesday, April 17, 2013 Debris on the roadway is causing traffic delays this morning at Interstate 35 and Walzem Road. The incident is reportedly causing delays through a long stretch of the highway's northbound lanes, according to the TransGuide website. Traffic on police radios indicated that the debris may have been a load of coils that fell off a big rig at the site.