Highway 21 has average annual daily traffic (AADT) of 500 vehicles a day and truck traffic is 30% of this total. Unity has two inland grain terminals. The oil and gas industry is also active in this area.
In 1999 the granular pavement section of Highway 21 north of Kerrobert was tested with a cold in-place recycling or “CIR” method to rehabilitate highways. This CIR process is a cost-effective method which recycles the top surface of a road. This pulverized material is mixed with asphalt emulsion and spread and compacted back onto the highway surface. This surface is then recovered with a new seal dependent on traffic volume.
^Gerbrandt, Ron (2000). "Guidelines must be followed strictly - No exceptions"(PDF). Effect of Cold-in-place recycling on the Heavyweight Trucking Industry. Tim Makahoniuk, Cathy Lynn Borbely, Curtis Berthelot. 6th International Conference on Heavy Vehicle Weights and Dimension Proceedings. Retrieved 2009-01-25.