到2024年，由于高速公路15亿美元的高速公路和改装项目，新的州际公路将从密歇根州的加拿大边境延伸到印第安纳州肯塔基州线。

6号州际公路9 was first pitched in the 1940s as a single, continuous route from the Texas-Mexico line to Canada. While states such as Louisiana and Mississippi still seek federal money before starting their portions of the border-to-border highway, Indiana is closing in on finishing its part of I-69 that started in 1971.

The “finish line” portion being completed in southern Indiana involves 26 miles of new highway construction and 35 miles of reconfigured roads stretching from Martinsville to Indianapolis. It upgrades the existing State Road 37 to interstate standards and eliminates at-grade crossings, adds overpasses and local access road connections and 10 interstate access points throughout the corridor.

The project’s northern I-465 terminus will include adding a travel lane between I-70 near the Indianapolis airport to I-65 on the southeast side of the city. Once completed in 2024, I-465 will be reshielded to I-69 on the southeast and east side of Indianapolis to the existing I-69 terminus on the northeast side of the beltway. To bring SR 37 up to standards, more than 35 lane-miles of new local access roads and 39 new bridges need to be added while existing bridges need to be rehabilitated. By 2024, I-69 will run continuously from Port Sarnia, Mich., to Evansville and the Kentucky state line.

Project challenges included providing access, minimizing real estate acquisition and coordinating utilities while reconfiguring much of the existing route to accommodate the new interstate. When the project is completed, the time it takes to travel from Martinsville to Indianapolis is expected to be reduced by 11 minutes thanks to the elimination of 14 signal lights on the state route. Portions of I-69 north of Indianapolis were the ones built as part of other projects since the 1970s.

“Almost all of it needs new drainage infrastructure,” says Tim Miller, senior project manager for designer HNTB, a consultant to the Indiana Dept. of Transportation. “We have moved high-tension power lines, a gas line going along much of SR 37, and considered endangered species and other natural environmental features along the corridor.”

INDOT acquired more than 700 parcels along the corridor, according to Sarah Rubin, agency project manager for the I-69 corridor. Businesses, homes, farmland and such municipal buildings as a fire station had to be acquired along the corridor. The project team focused on minimizing impacts to the natural environment and then mitigating impacts that were unavoidable. Cultural resource challenges for the project included avoiding impacts to archaeological and historically significant properties and structures.

“During the environmental process, when we got into right-of-way acquisitions, we really tried to minimize the impact,” she says. “We met with business groups to understand how their suppliers are getting to them—if there were certain needs or constraints they had. That was a continuous theme throughout the entire corridor. Understanding the assumptions of how people are using the corridor and what the needs of those businesses or residents would be was important. Access and thoughtful placement of interchanges are topics that kept arising.”

Land had to be conserved for a native endangered bat species. Rubin says that some of the limestone quarries in the area remain active, and the final alignment had to consider some of the dormant ones because they may become active again at a later date.

“It’s kind of a balance of what you pull out of the ground versus what inevitably goes back into the ground, too,” she says.

Divvied Up

I-69终点线项目分为五个不同的合同。五个合同中有四个通过设计竞标构建方法交付。然而，鲁宾说，最大的合同中正在使用设计最佳价值的方法，因为它允许投标人提出设计元素，配置和安全功能，而这些元素，配置和安全功能可能无法通过不太敏捷的传统采购来提出。作为下一个级别的道路计划的一部分，在2018年州长埃里克·霍尔科姆（Eric Holcomb）的指示中，所有五项合同都加速了三年。

Contracts 1, 2, and 3 are under construction, while Contracts 4 and 5 are anticipated to have notice to proceed by the end of the year. Contract 1 was awarded in December 2018 to Milestone Contractors for utility relocation and a new interchange, new local access roads and the overpass in Martinsville. That project began in early 2019. Martinsville is a town that exists in a low-lying area that resembles a natural bowl in the hills of southern Indiana.

“There were a lot of utilities underground that needed to be moved,” says Ryan Whitaker, project manager at Milestone Contractors. “It was pretty isolated, and there was a pretty big effort to get utility relocation done for it. We had to fight the high water table that’s present down there.”

对于立交桥桥，里程碑必须安装机械稳定的土壁，并安装一个9英尺乘5英尺的盒装，该涵洞在现有的37号公路下运行以进行排水。承包商还必须在2019年的雨季特别雨期间将地下水放在立交桥下方的桥墩和MSE墙壁下方。

For the mass-concrete bridge piers, the max temperature could not exceed 150°F, and Milestone had to monitor temperature hourly during its pier placements. Bags of ice were used to cool the concrete at its time of placement from the trucks.

The bridge has been well received by residents thanks to decisions enabled by the design-build process to make enhancements that were both inexpensive and could be approved by the community.

“During the design development phase—which Sarah [Rubin] and I worked on—we were trying to think of what would be an efficient yet timeless way to connect the aesthetic parts of the bridge and Martinsville High School, which is one side of the overpass,” Miller says. “They had just rebranded their school, which included a large M on a brick pattern that matched the county courthouse. So as part of a collaborative process with local representatives, we came up with the idea of placing a red M on the bridge. The school had a lot of problems with pedestrians, with students crossing SR 37, trying to get over to this commercial center. The brick theme will be carried elsewhere in the corridor.”

Miller said the bridge was welcomed as a safety enhancement because the school and the nearby Wal-Mart, restaurants and other businesses on the opposite side of the highway now have safe east-west connectivity over the pedestrian part of the bridge. Ornamental lighting keeps the bridge lit at night and fencing on both sides enhances safety.

米勒说：“对于整个走廊来说，意图是总会有东西方连接，以便人们可以往返学校，企业及其工作。”“我们正在从一个有92个接入点的设施过渡，从私人和商业驱动器到州和县道，到仅10个交换访问点。”