Running of the bulls into the turn at Estafeta ("la curva"), resulting in the installation of anti-slip surfacing, and now most of the bulls negotiate the turn onto Estafeta and are often ahead of the steers. This has resulted in a quicker run. Runners are not permitted in the first 50 meters of the encierro, which is an uphill grade where the bulls are much faster. Every year, between 50 and 100 people are injured during the run. Not all of the injuries require taking the patients to the hospital: in 2013, 50 people were taken by ambulance to Pamplona's hospital, with this number
Running of the bulls herd is . The length of the run is . It goes through four streets of the old part of the city (Santo Domingo, Ayuntamiento, Mercaderes and Estafeta) via the Town Hall Square and the short section "Telefónica" (named for the location of the old telephone office at end of Calle Estafeta) just before entering into the bullring through its callejón (tunnel). The fastest part of the route is up Santo Domingo and across the Town Hall Square, but the bulls often became separated at the entrance to Estafeta Street as they slowed down. One or more would slip going