Lanes of opposing directions should always be separated either by a grass median, usually of sufficient width to prevent cross-directional collisions, to provide drainage, and may allow for future expansion, or an "Ontario tall-wall" concrete barrier if a grass median is not feasible (the tall wall is based upon the Jersey barrier but is not reinforced and higher at 1070-mm).
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400-series highway design has set the precedent for a number of innovations used throughout North America, including the parclo interchange and the modified Jersey barrier design known as an Ontario Tall Wall.
The construction work included an Ontario "tall-wall" concrete median barrier, new bridge parapets, and the installation of shaded high-pressure sodium lights using the existing truss poles.
For the rest of I-129's length, the two directions of I-129 / US 20 / US 75 traffic are separated by a Jersey barrier instead of a grassy median.
The 2010 G-20 Toronto summit used a modified modular Jersey barriers with wired fencing bolted onto the concrete.
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In Ontario, the Ministry of Transportation is replacing guiderails (steel guardrail and steel box-beam) with these barriers on 400-series highways.
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The fence used the barrier as sturdy base to prevent protesters from toppling the fence around the security zone at the Metro Toronto Convention Centre.
The parkway continues as a four-lane limited-access highway to Greenridge, where the road merges with the northern half of Drumgoole Boulevard to create a four-lane, two-way surface street with a Jersey barrier in the median.
The two-lane state highway curves east and closely parallels the northbound lanes of I-695 (Baltimore Beltway); the two highways are separated by a Jersey barrier.
Heavily congested during peak hours, the freeway now contains two central lanes that operate as high-occupancy vehicle (HOV) lanes during rush hours while separated by Jersey barriers from the road's regular traffic lanes.
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The two halves of the highway are separated by only a jersey barrier until Pearl Street (US 20 and NY 32), where the arterial enters a large interchange at the western end of the Dunn Memorial Bridge.