The National Highway Authority of India (NHAI) has decided to carry out four-laning of the Parwanoo-Shimla section of the NH-22 under a single project, instead of two separate projects as planned earlier. As per the decision, the Rs 808 crore project for the Parwanoo-Solan section and Rs 1,800 crore project for the Solan-Shimla section had been combined into a single project which would cost Rs 1,786 crore.

The decision was taken after work on the four-laning of Parwanoo-Solan was delayed due to redesigning of the project to change the alignment of some portions to avoid large-scale demolition of commercial and residential structures along the road.