 Construction progressed slowly, starting in 1960 near Orange. There were many obstacles that had to be overcome when constructing I-280. The first was whether to build the highway on an elevated or depressed alignment through urbanized areas of East Orange and Newark. Following opposition to the elevated option, it was decided to build I-280 on a depressed alignment through the area. In addition, there was an issue of building the road across First Watchung Mountain in West Orange. A tunnel had initially been considered, although the expense of such a project caused this alternative to be rejected. Instead, a rock cut along a longer route was built through the mountain. Much of the material that was excavated from this section of I-280 and east was removed via a temporary rail line that was built in the center of the right-of-way west to I-80.
