Startup Idea : travel at your cost

As a consumer , we are forced to pay what transporter wants us to. However the reality is also this that , many seats remain vacant especially during off peak seasons and week days. My idea is to create a space where in user selects his preferred mode of travel , give probable start date of travel (+/- tolerance) , source and target destination , gender and age . He would also state , till which time before start date he would like to take confirmed offer from transporter (say Till 3 Hrs before 22 Hrs on 25/09/2014) . He will also state minimum and maximum he would offer for the journey . He will deposit the maximum agreed amount in the web . There will be filters for the user like preferred transporter , preferred timing etc . Transporters will view such requirement and quote. User will confirm one and money will flow to the transporter once transporter confirms the booking.. This will help both the transporter and the traveler.