Hi Thilina, Yes I agree with you. I just followed "Road development Authorities (RDA) Numbering schema.
I think we may look at each road case by case and decide about the road class. Sometimes it might be difficult to judge the situation just by satellite maps available, we need some local knowledge too. So appreciate input from local commuters. Also There are roads partially developed. For ex : Colombo - Horana (B84) road. Its being developed (upgraded to 4 lanes) only up to Kesbawa (halfway between Horana and Colombo).