The Three-Foot Lane, Sliding Rules and Home Plate Collisions
How the three-foot running lane, runner interference, legal slides and the home plate collision rule work, with the logic behind each rule and worked examples of the calls umpires make.
Every baseball field has a strip of chalk that most fans have never noticed: a second line, three feet outside the foul line, running along the second half of the path to first base. The strip is the three-foot lane, and it exists to answer one question. When a ball is thrown to first base, where is the runner allowed to be? The answer shapes a handful of close calls each season, and it belongs to a family of rules about contact that also includes the sliding rule introduced in 2016 and the home plate collision rule that took effect in 2014.
All of these rules are in Rule 6.01 of the Official Baseball Rules, the section on interference, obstruction and collisions. They share one idea. A runner has the right to run the bases, a fielder has the right to make a play, and the umpire decides when one side has taken away the other's right. This article explains each rule in plain terms, shows why it exists and works through the calls umpires actually face.
What the three-foot lane is
On the base path between home plate and first base, the groundskeepers draw a second line three feet outside the foul line, starting halfway to first base (45 feet from home plate on a standard field) and ending at first base. The space between that line and the foul line is the running lane. The foul line itself is part of the lane. Because the foul line is fair territory and the lane lies outside it, the lane is in foul ground.
The rule places a duty on the batter-runner, the player who has just hit or tried to hit the ball and is running to first. In the second half of the distance, while a fielder is throwing the ball to first base, he must stay inside the lane, with both feet in it or on the foul line. If he runs outside the three-foot line, or on the infield side of the foul line, and in the umpire's judgment interferes with the first baseman taking the throw, he is out, the ball is dead and the other runners return to the last base they legally touched.
Three details do most of the work in that sentence. The rule is about the second half of the distance, so a runner in the first 45 feet can run anywhere. It applies only while the ball is being fielded to first base, which in practice means a throw from the catcher, the pitcher or an infielder. And it applies only when there is interference in the umpire's judgment: a runner who is outside the lane but does not affect the play has not violated the rule.
Why the lane exists
Think about the geometry of a bunt. A batter pushes a ball a few feet in front of the plate, and the catcher or the third baseman has to pick it up and throw to first. The throw travels toward first base from the infield side, the fair side of the line. A runner who is running on the infield side of the foul line is running through the area where the throw is heading, and the first baseman, who has to watch the ball and find the base, may have to dodge him or catch a ball that glances off him.
The lane gives the throw a corridor. The runner is on one side of it, in foul ground, and the fielders are on the other. It is a rule built for safety and fairness together: no one is forced to choose between catching the ball and avoiding a collision, and no runner can win an advantage by running in the throw's path and hoping for an errant throw.
The batter-runner on a dropped third strike
The lane is not just for batted balls. When a batter swings at a third strike that the catcher fails to hold, the batter becomes a runner and may try to reach first. The dropped third strike rule explains when that is allowed. In those plays the catcher throws to first, and the lane rule applies in exactly the same way: the batter-runner is expected to be in the lane, and if he interferes with the throw, he is out.
Exceptions and the limits of the rule
The rule says a runner may leave the lane for one reason: to avoid interfering with a fielder who is trying to field a batted ball. If a bunt rolls up the first-base line and the pitcher or first baseman is moving toward it, the runner may step to the infield side to get around him. The runner's duty not to interfere with a fielder fielding a batted ball outranks his duty to stay in the lane.
There is also the matter of what counts as interference. The umpire has to decide that the runner's position actually hindered the first baseman. A runner who is outside the lane when the catcher's throw passes safely to first has done nothing wrong. A runner who is in the lane when a throw hits him has not violated the rule either, though a throw that hits a legally positioned runner is a live ball: it can roll away and the runner can go on to second. The rule punishes position plus consequence, not position alone.
Interference and obstruction: two ideas, two penalties
The lane rule is one case of a wider principle, and two terms from the rulebook help sort it out.
Interference is an act by the offense that hinders a defensive player trying to make a play. The standard penalty is that the offender is out and the ball is dead. Examples are a batter-runner outside the lane and a runner who knocks a ball out of a fielder's hand.
Obstruction is the mirror image: an act by a fielder who does not have the ball and is not in the act of fielding it, and who impedes a runner. The penalty favors the runner. If a play is being made on the obstructed runner, the ball is dead and the umpire awards bases; if no play is being made on him, the play continues and the umpire then imposes whatever penalty will undo the effect. A catcher who plants himself in the runner's path to the plate without the ball is committing obstruction, and the 2014 collision rule, described below, was written to deal with exactly that picture.
The runner's own path: the three-foot baseline
A separate three-foot figure in the rulebook causes confusion with the lane. A runner who is being chased by a fielder holding the ball is out if he runs more than three feet away from his direct path to the base to avoid being tagged. The path is a straight line from the runner's position to the base he is trying to reach, and it is established at the moment a tag attempt begins. If no fielder is trying to tag him, he can run a curved route, as he often does when rounding a base. The only exception to the rule is the same as for the lane: he may leave the path to avoid interfering with a fielder fielding a batted ball.
So there are two three-foot rules. The lane governs the batter-runner running to first while a throw is coming. The baseline rule governs any runner dodging a tag. They are easy to mix up, and a good way to remember the difference is that the lane is drawn on the grass in chalk and the baseline is not drawn at all.
Sliding: what is legal and what is not
A slide is how a runner gets to a base safely while avoiding a tag. The basic forms are the feet-first slide, the head-first slide, the hook slide (reaching a hand or foot toward a corner of the base while the body swings away from the tag) and the pop-up slide (sliding feet-first and rising to a standing position on the base). A runner is not required to slide on a play where no fielder is making a play on him, and he is allowed to run through first base, where he can overrun the bag without risk of being tagged as long as he returns immediately. A runner who overslides second or third can be tagged out, and that is why runners at those bases aim to stop on the bag.
The question becomes pointed on a force play at second base, with a runner coming from first trying to disrupt a double play. For generations runners were allowed to slide hard toward the fielder, and the pivot man was expected to jump or dodge. In the 2015 National League Division Series, a slide by Los Angeles Dodgers second baseman Chase Utley broke the leg of New York Mets shortstop Ruben Tejada. The collision prompted a rules change for 2016, sometimes called the Utley rule, which is now part of Rule 6.01, in the clause on a runner's slide.
The rule on sliding to break up a double play
The current rule says a runner must make a bona fide slide when going into a base in a way that might contact a fielder. In practice the umpires check four things. The runner must begin the slide, that is make contact with the ground, before he reaches the base. He must be able and attempt to reach the base with his hand or foot. He must be able and attempt to remain on the base after the slide, except at home plate. And he must slide within reach of the base without changing his path for the purpose of initiating contact with a fielder.
A runner who fails these tests can be called for interference. The penalty is severe: the umpire declares both the runner and the batter-runner out. That penalty makes the rule a deterrent, because a late or off-line slide can now cost the offense two outs instead of buying it a disrupted double play.
Two features keep the rule from being a ban on contact. Contact that is the incidental result of a legal slide is allowed, and the rule applies to a runner whose slide is illegal in the umpire's judgment, not to every collision. Calls under the rule have been subject to replay review in recent seasons, so a crew can check whether the runner went for the base or for the fielder.
Home plate collisions: the 2014 rule
The most dangerous collision in baseball is the one at home plate: a runner of 200 pounds or more moving at full speed, a catcher in the path with his back to the third-base line and a split second in which both must decide what to do. For most of the sport's history, it was accepted as part of the game. Concern about injuries, especially concussions, grew through the early 2010s, and a widely seen collision in 2011 in which San Francisco Giants catcher Buster Posey suffered a broken leg and torn ligaments after being hit by Florida's Scott Cousins made the issue impossible to ignore.
The league and the players' union agreed on a rule that took effect for the 2014 season. It was first numbered 7.13 and now sits at Rule 6.01(i), titled collisions at home plate. It has two main parts.
First, a runner may not deviate from his direct pathway to the plate in order to initiate contact with the catcher, or with another player covering home plate. If a runner does so, he is called out, whether or not the catcher holds the ball, and the ball is dead. Second, unless the catcher has the ball, he may not block the pathway of the runner as he tries to score. If the umpire judges that a catcher without the ball blocked the path, the runner is called safe.
The exceptions that make the rule workable
Two clauses keep the rule from being unfair. A catcher who blocks the pathway because he must in order to catch a throw is not in violation if the umpire decides that he could not have fielded the ball without blocking the path and contact was unavoidable. And a runner who slides legally, in a way that would satisfy the sliding rule, is not in violation even if contact results.
The rule does not forbid a catcher from blocking the plate once he has the ball in his glove, and it does not forbid a collision that happens in the normal course of a play. It targets two specific behaviors: the runner who leaves his path to hit the catcher and the catcher who blocks the plate before he has the ball. Plays under the rule were also covered by the expanded replay review that began in the same 2014 season, so managers could challenge a call.
What changed on the field
The effect is visible in how plays at the plate look. Catchers commonly set up in front of the plate or off to one side to leave the runner a lane, catch the throw and then sweep a tag as the runner slides. Runners are taught to slide, sometimes around the catcher, rather than to try to run through him. Plays at the plate that were once decided by who was bigger are now decided by the quality of the throw and the slide.
Amateur baseball has its own code. High school, college and youth leagues each publish rules on contact and sliding, and many require a runner to slide or avoid contact with a fielder, with ejection as the penalty for malicious contact. Anyone coaching or playing at those levels should read the rule book that applies to their league, since the professional rules above do not carry over automatically.
Six calls to test yourself
- A runner on a bunt runs on the infield side of the foul line and the catcher's throw hits him in the back. If the umpire judges that he hindered the throw, it is interference. The runner is out and the ball is dead.
- A batter-runner is outside the lane, but the throw sails safely into the first baseman's glove. No call. There was no interference.
- A bunt rolls toward the first baseman, who moves up the line to field it. The runner veers to the infield side to avoid him. Legal. The exception for avoiding a fielder covers it.
- A catcher without the ball stands in the runner's path to the plate and stops him from reaching it. The runner is called safe under the collision rule, unless the umpire decides the catcher had to block the path in order to field the throw and contact was unavoidable.
- A runner leaves the base path to hit the catcher, who has the ball and is tagging. The runner is out, whether or not the catcher holds on.
- A runner slides to the outfield side of second base, away from the bag, and hits the shortstop. This is the situation the slide rule was written for. Without a bona fide attempt to reach the base, the umpire can call interference, and the batter-runner is called out too.
Common questions
Is the three-foot lane in fair or foul territory? Foul. It lies between the foul line and the line three feet outside it, and a runner on the foul line itself is also legal.
Does the runner have to stay in the lane the whole way to first base? No, only for the second half of the distance and only while a throw to first base is being made.
Can a catcher ever block the plate? Yes, once he has the ball, or when the umpire judges that blocking is unavoidable to field the throw.
Is a runner required to slide? Not in general. But a runner who makes contact with a fielder in a way that a legal slide would have avoided can be called for interference.
Are these rules the same in Little League? Not necessarily. Youth leagues have their own rule books, so check the one your league uses.
Where to go next
These rules sit alongside other rare calls covered in the balk rule explained, the infield fly rule and the rules of fair and foul balls. For the wider list of unusual situations, read batting out of turn and other rare rules, and for related articles by topic, see the rules and umpiring page.