This paper examines recent street tests of autonomous vehicles (AVs) in the UK and makes the case for an experimental approach in the sociology of intelligent technology. In recent years intelligent vehicle testing has moved from the laboratory to the street, raising the question of whether technology trials equally constitute tests of society. To adequately address this question, I argue, we need to move beyond analytic frameworks developed in 1990s Science and Technology Studies, which stipulated "a social deficit" of both intelligent technology and technology testing. This diagnosis no longer provides an effective starting point for sociological analysis, as real-world tests of intelligent technology explicitly seek to bring social phenomena within the remit of technology testing. I propose that we examine instead whether and how the introduction of intelligent vehicles into the street involves the qualification and re-qualification of relations and dynamics between social actors. I develop this proposal through a discussion of a field study of AV street trials in three cities in the UK-London, Milton Keynes, and Coventry. These urban trials were accompanied by the claim that automotive testing on the open road will enable cars to operate in tune with the social environment, and I show how iterations of street testing undo this proposition and compel its reformulation. Current test designs are limited by their narrow conception of sociality in terms of interaction between cars and other road users. They exclude from consideration the relational 538 | MARRES O Public Road You express me better than I can express myself You shall be more to me than my poem Walt Whitman, The Open Road 1 | INTRODUC TI ON At least since early 2016, so-called autonomous vehicles, or driverless cars, have been tested on urban roads 1 across the UK, in London, Milton Keynes, Bristol, and Coventry. 2 The most well known of these tests are funded by the UK government, by way of its Centre for Connected and Autonomous Vehicles (CCAV), and among their principal aims is to demonstrate the capacity of intelligent vehicle technologies to operate successfully amidst social complexity, on the open road. As the Department for Transport explained the approach in its 2015 code of practice for such testing:Manufacturers have a responsibility to ensure that highly and fully automated vehicle technologies undergo thorough testing and development before being brought to market. Much of this development can be done in test laboratories or on dedicated test tracks and proving grounds. However to help ensure that these technologies are capable of safely handing the many varied situations that they may encounter throughout their service life, it is expected that controlled "real world" testing will also be necessary. Testing of automated vehicle technologies on public roads or in other places should be facilitated while ensuring that this testing is carried out with the minimum practicable risk. (Department for Transport, 2015, my italics) 3 As the ...