The way to approach this is: 1. Create a company, build a small DB of rules in UK (the closest road cousin to India), Australia and US. Maybe Hongkong to understand dense cities
2. Get estimates of costs required to stripe lanes, put traffic lights, green road signs
3. Make a list of 10 rich cities/municipalities. Approach their roadworks dept and propose a plan
4. Profit
Developing countries these days are willing to throw money at this. They just want someone to do it efficiently and at low cost.
To see how this worked before, look at Jakarta, Indonesia.