The Ontario Tall Wall is a 1070-mm-high concrete median barrier with the same profile, but no reinforcing. A crash test with a 36,000-kilogram (80,000-pound) tractor-trailer at 85.3 kilometers per hour (53 miles per hour) and an impact angle of 15 degrees demonstrated that reinforcing was not necessary ecause the Ontario Tall Wall is 305 mm at the top. Even though concrete shrinkage cracks formed vertically approximately every 2440 to 3355 mm (8 to 11 feet) and penetrated completely through the cross section of the barrier, the cross-sectional area and the aggregate interlock were sufficient to transfer all of the lateral impact forces across the cracked cross-sections.
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