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High Five Interchange
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High Five Interchange
The High Five Interchange is one of the first five-level stack interchanges built in Dallas, Texas. Located at the junction of the Lyndon B. Johnson Freeway (Interstate 635, or I-635) and the Central Expressway (U.S. Highway 75, or US 75), it replaces an antiquated combination interchange constructed in the 1960s.
The $261 million (equivalent to $434 million in 2024) project was started in 2002 and completed in December 2005; 13 months ahead of schedule. It was designed by HNTB and built by Zachry Construction Corporation.
The interchange is considered by Popular Mechanics to be one of "The World's 18 Strangest Roadways" because of its height (as high as a 12-story building), its 43 permanent bridges, and other unusual design and construction features. In 2006, the American Public Works Association (APWA) named the High Five Interchange as "Public Works Project of the Year".
The High Five Interchange, north of downtown in Dallas, Texas, is a massive five-level freeway interchange. It is the junction of two major highways carrying heavy rush-hour traffic, the Lyndon B. Johnson Freeway (I-635) and the Central Expressway (US 75), and is the first five-level stack interchange to be built in the city.
It replaces the antiquated three-level modified cloverleaf interchange built in the 1960s, which caused a severe bottleneck by narrowing US 75 down to two lanes at the junction of the two highways. The looped ramps of the cloverleaf forced motorists to slow down drastically, backing up traffic. Left-hand exits contributed to the congestion. Further, its two frontage roads were not directly connected to each other, making local access difficult.
Alluding to the celebratory gesture, the "High Five" name refers to the five flyover ramps that tower over the landscape, handling the left-turn movements. The interchange is as high as a 12-story building and includes 43 bridges spread across five levels (the "High Five"), 710 support tiers, and 60 miles (97 km) of additional highway lanes. The highest ramps are 100 feet (30 m) above ground. The lanes of US 75, which are on the bottom level, are 20 feet (6.1 m) below ground level, giving the structure a total height of 117 feet (36 m) from bottom to top. As part of the project, I-635 was widened to include four dedicated high-occupancy vehicle lanes (HOV lanes) that are barrier-separated and reversible.
The new lanes for regular traffic were built on the outer vacant right-of-way, while the HOV lanes were built in the median. The original I-635 lanes that passed through the former interchange, now demolished, were relocated between the new regular and HOV lanes.
From bottom to top, the roads on the five levels are:
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High Five Interchange
The High Five Interchange is one of the first five-level stack interchanges built in Dallas, Texas. Located at the junction of the Lyndon B. Johnson Freeway (Interstate 635, or I-635) and the Central Expressway (U.S. Highway 75, or US 75), it replaces an antiquated combination interchange constructed in the 1960s.
The $261 million (equivalent to $434 million in 2024) project was started in 2002 and completed in December 2005; 13 months ahead of schedule. It was designed by HNTB and built by Zachry Construction Corporation.
The interchange is considered by Popular Mechanics to be one of "The World's 18 Strangest Roadways" because of its height (as high as a 12-story building), its 43 permanent bridges, and other unusual design and construction features. In 2006, the American Public Works Association (APWA) named the High Five Interchange as "Public Works Project of the Year".
The High Five Interchange, north of downtown in Dallas, Texas, is a massive five-level freeway interchange. It is the junction of two major highways carrying heavy rush-hour traffic, the Lyndon B. Johnson Freeway (I-635) and the Central Expressway (US 75), and is the first five-level stack interchange to be built in the city.
It replaces the antiquated three-level modified cloverleaf interchange built in the 1960s, which caused a severe bottleneck by narrowing US 75 down to two lanes at the junction of the two highways. The looped ramps of the cloverleaf forced motorists to slow down drastically, backing up traffic. Left-hand exits contributed to the congestion. Further, its two frontage roads were not directly connected to each other, making local access difficult.
Alluding to the celebratory gesture, the "High Five" name refers to the five flyover ramps that tower over the landscape, handling the left-turn movements. The interchange is as high as a 12-story building and includes 43 bridges spread across five levels (the "High Five"), 710 support tiers, and 60 miles (97 km) of additional highway lanes. The highest ramps are 100 feet (30 m) above ground. The lanes of US 75, which are on the bottom level, are 20 feet (6.1 m) below ground level, giving the structure a total height of 117 feet (36 m) from bottom to top. As part of the project, I-635 was widened to include four dedicated high-occupancy vehicle lanes (HOV lanes) that are barrier-separated and reversible.
The new lanes for regular traffic were built on the outer vacant right-of-way, while the HOV lanes were built in the median. The original I-635 lanes that passed through the former interchange, now demolished, were relocated between the new regular and HOV lanes.
From bottom to top, the roads on the five levels are:
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