You can now share traffic information on road.lk via Instagram. Just grab an Instagram pic as you normally would. Add the #traffic hashtag and the exact location to the caption. Don't forget to add a two letter country code as well. For example if you are in Sri Lanka add #lk to the list of tags. If you are in Bangladesh please add #bd , for India it's #in and so on.
Alternatively, you can add a geo tag to your pic. In that case you don't need to manually add the street name to the caption, but please do include the #traffic tag.