Since the company was contracted to build 4000 bollards on each side of a road, they were to install a total of 4000*2 = <<4000*2=8000>>8000 bollards on all sides of the road.
The company was only able to install 3/4*8000 = <<3/4*8000=6000>>6000 bollards on all sides of the road.
They required 8000-6000 = <<8000-6000=2000>>2000 more bollards to install on all sides of the remaining part of the road.
#### 2000