. >> ct is perrot they think we all agree with that but it can be done as we move forward to make sure we look at the technology and safety aspect that one size does not fit all. thank you. >> that will focus my initial questions on my side of the aisle. but wanted to talk about the technology side and had to look at the six test sites to make an assessment if they're used as much as they can? or what would you suggest me done otherwise? >> of the six test sites are not my expertise but m.i.t. was heavily involved to set up one of them and i got back in september so i have not looked at what is available there. >> q. did your research and course of study what is the ideal environment? mcfadyen is a good question. one of the limitations is the distance one has to go to get to the test site in the onus of setting up the operations and in the ideal world with the ability to do designate flight areas anywhere with clear rules i pick the numbers arbitrarily but 150 meters from a ground structure or people to secure the airspace presumably you could not do that downtown cambridge sign that m