Based on threads here and the official forum, it seems that there is a well known issue with Sunpass working through (most) windshields. The recommendation is to call and order the external mount Sunpass and install it in the nose-cone. There is also the HOV Exemption for ILEV vehicles which does include the Tesla, allowing you to use HOV lanes, including the 95 Express lanes in Miami-Dade county. The tolls here can be quite high ($10 at times), and the exemption is quite valuable. The 95 Express website states: "If you have a SunPass transponder you will need to indicate which type below so SFCS can provide you with a transponder shield. You will be responsible for shielding your SunPass transponder when using the 95 Express Lanes as a toll free-user or you may be responsible for any toll charges incurred. " My understanding of this means that there is therefore no way to shield the external mount only when riding the 95 Express lanes, and therefore this option is impossible. What have others done?