BRO Road marker sign says "BRO Makes a Way for Your Bright Future" - "BRO Can Construct Road Anywhere - Sky is the Limit".
Road sign from BRO (the Border Roads Organisation), that built the mountains roads and bridges between West Bengal and Sikkim, as part of "Project Swastik".
For more info about the Border Roads Organisation (BRO), read en.wikipedia.org/wiki/Border_Roads_Organisation.