VG-10 is widely used in spraying applications such as surface-dressing and paving in very cold climate in lieu of old 85/100 Penetration grade. It is also used to manufacture Bitumen Emulsion and Modified Bitumen products
VG-20 is usually used for paving in cold climate & high altitude regions
Vg30 is primarily used instead of 50/70 bitumen for road construction in difficult conditions that need to bear a significant traffic load.
VG-40 is used in highly stressed areas such as intersections, near toll booths and truck parking lots in lieu of old 30/40 Penetration grade. Due to its higher viscosity, stiffer Bitumen mixes can be produced to improve resistance to shoving and other problems associated with higher temperature and heavy traffic loads.