The off-ramp from I-88 to Eola Road was causing serious concern for the Illinois State Toll Highway Authority due to ponding water after a rainstorm. The lack of a retaining wall between the off-ramp and the road surface was exacerbating the problem. Ponding water and fast-moving traffic was not a good combination and posed a potential safety hazard.
To resolve this issue, the Illinois Tollway Authority considered replacing the existing slotted pipe system with either a similar slotted pipe product or a trench drain system. The Tollway Authority decided to use a trench drain system for its superior drainage performance; a larger intake area would enable faster, more effective removal of surface water and minimize the risk of bypass (where sheeting water passes over the inlet slot).