Yesterday was the first day to buy 5 new types of Good To Go toll transponders. Purchase one before April 15th and get $10 dollars of free tolls per transponder. This is all part of the SR-520 tolling roll out which will occur sometime this spring. A specific start date has not been decided on because the legislature still has to authorized the tolls. You can sign up online, at some Safeways or Good 2 Go Service Centers, or over the phone. I’m personally getting the “Switchable Pass” which allows you to turn its readability on and off, which will be important for anyone planning to carpool in HOT lanes.