WASHINGTON – The Obama administration is developing plans to wind down the popular Cash for Clunkers program and could announce by Friday when the incentives will no longer be available. Transportation Secretary Ray LaHood said Wednesday the department would announce within 48 hours how it intends to discontinue the program .. Through early Wednesday, auto dealers have made deals worth $1.81 billion and are on pace to exhaust the program's $3 billion in funds in early September. The incentives have generated more than 435,000 vehicle sales but dealers want a clear plan on when the rebates will no longer be...