The Pamplona encierro is not just a run with bulls. It is a run with six hundred other people in an 875-meter corridor. Managing that human element is what separates first-timers from experienced mozos. The bulls will be there every morning they should be; you can count on that. What you cannot count on is whether the crowd ahead of you will remain stationary or will surge backward with the first vibration of hooves. Reading the crowd has become as essential as reading the route itself.
This skill develops over years, not hours. According to sanfermines.net, the route winds through “tortuous medieval streets of the Old Part of the city,” featuring “steep slopes, double right angle bends, narrow, shady streets,” and “there is even a tunnel at the end.” Every section presents different crowd dynamics. Understanding which visual and physical cues indicate where the bulls are, and how far away they remain, is what allows a runner to maintain position rather than react in panic.
The Instinct of Reading Crowds
Crowd reading is learned behavior. It cannot be taught in the traditional sense. Dennis Clancey, founder of Encierro and member of La Unica Pena, explains it this way: “So much of what a runner is doing is instinct they build over time of running.” What appears to be magical perception is actually the accumulation of dozens of runs, each one storing information about how human bodies respond when they sense danger.
The first lesson is this: people are responsive. When six hundred runners suddenly shift their weight or lean away from a particular section, there is a reason. The crowd’s collective body language communicates what individual runners cannot yet see or hear. Learning to read that language means paying attention not just to what is happening near you, but to what is happening two sections ahead.
On Sunday mornings, the crowd includes first-timers, repeat runners, and experienced mozos all compressed into the same streets. The first-timers tend to panic earlier. The experienced mozos remain calmer. If you stay close enough to someone who has run the encierro before, you can observe their behavior and learn when they tense and when they relax. That reaction teaches you as much as any verbal instruction.
Cable Cameras and Strategic Observation Points
There are two places along the run route where technology does the work of reading the crowd for you: the overhead cable cameras. These cameras track the lead animal in real time, and if you know where they are, you can use them as reference points.
“There are two places along the run route where you have cables over the run route with cameras affixed and that cable camera will track over the lead animal,” Dennis confirms. The first location covers the initial section: “This is the top part of Santo Domingo through town hall and then also at the beginning of La Curva leading up pretty much the entire most of Estafeta.” If you position yourself where the camera cannot track you, you have already positioned yourself away from the optimal line.
Before cable cameras existed, and in sections where they do not reach, experienced runners developed alternative systems. The balcony phenomenon became the substitute technology. Where you cannot see the camera, you watch what the people with expensive balcony seats are watching.
Reading the Balcony Watchers
The balconies overlooking the encierro route are expensive. Families and groups pay hundreds of euros for a few seconds of clear sight line to the bulls. This investment creates a behavioral pattern that experienced runners have learned to exploit.
“Runners will sometimes look for the camera flashes or where the people on the balcony are looking,” Dennis notes. “People pay a lot to be on those balconies, and they only get seconds to see the bulls come past them. You can guarantee their eyes are gonna be fixed on where the bulls are.” This simple fact makes the balcony watchers into a human early warning system.
When the crowd around you remains forward-focused and calm, the bulls have not yet reached the section. When you see heads turning simultaneously toward you, or bodies beginning to tense, the bulls are entering that space. Dennis describes the mechanism precisely: “Getting a sense for when those heads turn towards you, and where they’re generally looking gives you a sense of how far the bulls have moved down the street.”
This works because the balcony watchers have no reason to look away from the main spectacle. They have paid to see one thing: the bulls. Everything else is peripheral. When their heads turn to follow movement below them, the movement they are tracking is a pack of very large animals.
Crowd Waves and Bottleneck Psychology
The Pamplona encierro creates natural bottlenecks. Santo Domingo is steep and narrow. The curve at the transition into La Curva de Estafeta is sharp. The tunnel at the end funnels hundreds of people through a space that only allows a few abreast. Each bottleneck creates a pressure point where crowd density reaches its maximum. Okdiario’s encierro coverage has captured the consequences when runners misjudge crowd density at critical choke points.
At these pressure points, the crowd behavior changes. People stop moving forward and instead move laterally, pressing against the barriers. When the bulls approach a bottleneck, they must navigate through the same human-created barrier, and their movement is necessarily slower. Reading the crowd at a bottleneck means understanding that a surge backward does not indicate imminent contact; it indicates crowding. The bulls will navigate through, just as you must.
In contrast, the flat, wider sections of the route such as the town hall square and the open stretch of Estafeta allow the crowd to spread laterally. Here, movement is less constrained, and the crowd can react faster. A surge in these sections carries different information than a surge in a bottleneck. Learn the difference between crowd reaction caused by spatial constraint and crowd reaction caused by bull approach.
The Five-Lane Positioning Model
One of the most useful frameworks for understanding crowd positioning comes from Dennis: “You’re not right against the wall. You’re not right in the center. You’re somewhere in between. If you think of the route horizontally as a five lane track, you’re running lane two or four. You’re not in one, three, or five.”
Lane one is the position closest to the barrier or wall on one side. This is often where runners try to hide, assuming proximity to an obstacle provides safety. It does not. Lane five is dead center, which is where experienced runners who are attempting to run on the horns position themselves, traveling directly in front of the bulls at race pace.
For first-timers and most repeat runners, lanes two and four are optimal. These positions provide lateral space to move away from the bulls if necessary, but they keep you out of the primary line of advance. “Don’t be in the center of the street. Because that’s most likely where the bulls are gonna come through. Those are people looking to run on the horns at full sprint. That’s not you the first time you’re running,” Dennis advises. As Diario AS has reported in its live encierro coverage, the densest sections consistently produce the most incidents.
This is not arbitrary advice. It is a principle derived from anatomy, mass distribution, and the behavior of herd animals. The bulls have a line of sight forward, and they follow that line. By positioning yourself slightly outside that line, you reduce the probability of direct contact while remaining close enough to participate in the run.
Expert Insight: Dennis Clancey on Crowd Reading
“So much of what a runner is doing is instinct they build over time of running. There are two places along the run route where you have cables over the run route with cameras affixed and that cable camera will track over the lead animal. Runners will sometimes look for the camera flashes or where the people on the balcony are looking. People pay a lot to be on those balconies, and they only get seconds to see the bulls come past them. You can guarantee their eyes are gonna be fixed on where the bulls are. Getting a sense for when those heads turn towards you, and where they’re generally looking gives you a sense of how far the bulls have moved down the street.”
— Dennis Clancey, founder of Encierro and member of La Unica Pena
Dennis has been running since 2007, and he has spent far more time walking the route and teaching others than he has spent running it. This perspective allows him to observe patterns that participants themselves cannot see. The crowd is not an obstacle; it is a communication network. Learning to read it is learning to listen.
For a comprehensive visual walkthrough of the entire route, including where crowds typically gather at each section, watch the Definitive Guide to Running with Bulls, a video guide presented by Dennis Clancey and available in 16 languages. Cadena SER has documented how crowd management challenges intensify during the festival’s busiest days.
Spanish Vocabulary
Mozo (MOH-soh): A male runner of the bulls. The plural, mozos, refers to all the participants in the encierro. The term carries connotations of youth and participation, though mozos range in age from late teens to senior runners.
Suelto (SWELL-toh): A separated bull that has become isolated from the herd. Sueltos are considered more unpredictable and more dangerous because they lack the herd instinct that keeps the main pack moving forward.
La Curva de Estafeta (lah KOOR-vah deh es-tah-FAY-tah): The dangerous right-angle turn at the beginning of Calle Estafeta, where the centrifugal force often causes bulls to slip and separate from the herd.
Encierrillo (en-see-AIR-ee-yo): The small enclosure or pen where the bulls rest before the morning run. Distinct from the bullring where they will later be fought.
Casco viejo (KAS-koh vee-AY-hoh): The old quarter of Pamplona, containing all 875 meters of the encierro route within medieval streets.
Frequently Asked Questions
How can I tell if the bulls are close to my position?
The most reliable indicator is the behavior of experienced runners around you and the balcony watchers above you. If you see sudden head turns or a visible wave of movement backward from the section ahead, the bulls have entered that area. Cable camera locations also serve as reference points if you know where they are positioned.
What does crowd surge actually mean?
A surge does not always indicate bull approach. Crowd surge can also result from spatial constraint or from runners reacting to other runners reacting. Learn to distinguish between lateral pressure from crowding and backward movement from animal approach.
Should I position myself near the barriers?
Not unless you understand how to use barriers effectively. Positioning against a barrier reduces your ability to maneuver laterally. Use barriers as reference points, not as primary positioning tools.
What if I cannot see the bulls but everyone around me is moving backward?
This is exactly where crowd reading becomes essential. You must assess whether the backward movement is fear-driven or crowding-driven. If experienced runners around you remain calm, the backward movement is likely spatial. If the entire crowd is panicking visibly, reassess your position.
Is the five-lane model applicable at every section of the route?
No. The model applies best to sections with lateral space, such as town hall and most of Estafeta. In Santo Domingo, with its narrow passage and steep slope, the model changes because the street itself does not allow five lanes of separation.
Reading the crowd is a learned skill that separates first-timers from experienced runners. To understand the full route layout that shapes crowd behavior, read our guide to the complete encierro route. For strategies on positioning in specific sections, explore our post on the Mercaderes Stretch.