Generally with a construction loan you only pay interest on what’s paid out (e.g., work performed by the contractor). If the work has been completed and the contractor has been paid, what are you paying interest on?
I can understand your antsy-ness in getting the developer to finish the street so the city will grant final approval on the project so that your buyers can close. Again I suggest you speak to the developer and get a better completion date than “in a few weeks.” Ask him when the work is going to start. Get a firm start date, allowing for conditions outside the developer’s control (like adverse weather events).
You could also approach the city to add some pressure on the developer to finish the project.
You really have a hard time with the developers you work with, huh?