The Women’s 4 × 400 metres relay competition at the 2012 Summer Olympics in London United Kingdom was held at the Olympic Stadium on 10–11 August.In the final the USA had individual 400m bronze medalist DeeDee Trotter lead off. From the gun she put distance on the rest of the field. While the display clock read 49.57 for her split it was more like 50.3 handing the baton to Allyson Felix several meters ahead.
