Harsha was returning to the capital after a long days of travel. He was bored to death during his travel, so he was preoccupying himself by designing the horse-drawn omnibus. It was going to change the transportation system between cities.
It would shape to be one of the first public transport systems and a massive endeavor for the Empire. It will not only be lucrative for the Empire but also give rise to private players that would be keen to jump on these services in areas that the Empire doesn't plan to do, like town transports. It would speed up movement between cities and allow better circulation of goods.
The main reason was the faster travel for the job seekers. It would allow many villagers to go to faraway cities for jobs by spending very little.
