Guerrilla Public Service

At some point in your life you’ve probably encountered a problem in the built world where the fix was obvious to you. Maybe a door that opened the wrong way, or poorly painted marker on the road. Mostly, when we see these things, we grumble on the inside, and then do nothing. But not Richard Ankrom.

Screen Shot 2015-02-06 at 12.19.51 PM
Courtesy of Richard Ankrom

In the early morning of August 5, 2001, artist Richard Ankrom and a group of friends assembled on the 4th Street bridge over the 110 freeway in Los Angeles. They had gathered to commit a crime — one Ankrom had plotted for years.

Twenty years earlier, Ankron, then living in Orange County, was driving north on the 110 freeway. As he passed through downtown Los Angeles, he was going to merge onto another freeway, the I-5 North. But he missed the exit and got lost. And for some reason, this stuck with him.

Screen Shot 2015-02-06 at 12.18.02 PM
Courtesy of Richard Ankrom

Years later, when Ankrom moved to downtown Los Angeles, he was driving on the same stretch of freeway where he’d gotten lost before. He looked up at the big green rectangular sign suspended above and realized why he missed the exit all those years ago.

The sign was not adequately marked.

Screen Shot 2015-02-06 at 12.19.18 PM
Courtesy of Richard Ankrom

The I-5 exit wasn’t indicated on the green overhead sign. It was clear to Ankrom that, the California Department of Transportation (known as Caltrans) had made a mistake.

Ankrom, an artist and sign painter, decided to make the Interstate 5 North shield himself. He also decided that he would take it upon himself to install it above the 110 freeway.

He  would call it an act of “guerrilla public service.”

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Courtesy of Richard Ankrom

Ankrom started by studying L.A. Freeways signs and holding up pantone swatches to perfectly match the paint color. He dangled over bridges to measure the exact dimensions of other signs.

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Courtesy of Richard Ankrom

Most importantly, Ankrom consulted the MUTCD,  The Manual on Uniform Traffic Control Devices, which provides “uniform standards and specifications for all official traffic control devices in California.”

Screen Shot 2015-02-06 at 12.28.08 PM
Courtesy of Richard Ankrom

Ankrom wanted his sign to be built to the exact specifications of Caltrans, which were designed to be read by motorists traveling at high speeds.

He copied the height and thickness of existing interstate shields, copied their exact typeface, and even sprayed his sign with a thin glaze of overspray of gray house paint so that it wouldn’t look too new.

If he was successful, no one would know that the signs weren’t put up by Caltrans.

Screen Shot 2015-02-06 at 1.13.37 PM
Courtesy of Richard Ankrom

As a finishing touch, Ankrom signed his name on the back with a black marker, like a painter signing a canvas.

Then came the next phase of the project: the installation. Ankrom planned it with the precision of a bank heist. He cut his hair, bought some work clothes and a hardhat and an orange vest. He even made a Caltrans contractor-esque decal for his pick-up truck.

2015-02-09 10.19.38 am
Courtesy of Richard Ankrom

He feared he could get arrested, or worse — drop the sign or one of his tools on the cars driving underneath. But he felt it was too late to turn back.

Screen Shot 2015-02-06 at 1.15.28 PM
Courtesy of Richard Ankrom

On August 5, 2001, Ankrom parked his truck and went to work. He positioned his ladder over the razor wire and made his way up to the catwalk under the sign, nearly 30 feet above the highway.

Screen Shot 2015-02-06 at 1.16.19 PM
Courtesy of Richard Ankrom

The whole installation took less than 30 minutes. As soon as the sign was up, Ankrom packed up his ladder, rushed back to his truck, and blended back into the city.

For about nine months, only a small group of people knew that the Interstate 5 shield hanging above the 110 freeway was a forgery. Then one of Ankrom’s friend leaked the story to a local paper. And that’s how Caltrans found out.

Screen Shot 2015-02-06 at 1.17.31 PM
Courtesy of Richard Ankrom

Ankrom had hoped he could get his sign back from Caltrans after they took it down; he figured he would hang it in an art gallery. But Caltrans didn’t take the sign down. His guerrilla sign had passed the Caltrans inspection.

Screen Shot 2015-02-06 at 1.18.08 PM
Courtesy of Richard Ankrom

More than eight years after Ankrom’s sign went up, he got call from a friend who noticed some workers taking it down. His sign was being replaced with as part of routine maintenance.

When the new sign went up, however, Caltrans had added the I-5 North shield not only to it, but also to two additional signs up the road.

There is another guerrilla public service project in New York City by group called the Efficient Passenger Project. The EPP has been hanging signs in subway stations informing  people where they should board the train to make the most efficient transfers.

Courtesy of EPP NYC

Even though the EPP’s signage has the look and feel of those from the MTA, they are completely unaffiliated. The MTA considers these signs vandalism, and is taking down the signs as fast as they go up.

Point being, if you decide to undertake an act of “guerilla public service,” just know that it may not be received as such, so proceed with caution and avoid getting caught.

Be sure to check out similar 99% Invisible episodes and articles about cities  and infrastructure  including Built for Speed and The Magic Roundabout.



Reporter David Weinberg spoke with artist and guerilla public servant Richard Ankrom, and Ankrom’s friend and co-conspirator Amy Inoyou. David is a reporter with Marketplace and host of the podcast Random Tape.


“Fumes” — Aesop Rock
“Slowly” — Amon Tobin
“Keepin it Steel” — Amon Tobin
“Yasawas” — Amon Tobin
“Saboteur” — Amon Tobin
“Stoney Street” — Amon Tobin
“Chocolate Lovely” — Amon Tobin
“My Metro Card” — LeTigre
“Sifting in Sans” — Set in Sand

Comments (29)


  1. In Seoul, the subways lines almost all have transfer guides, and many subway apps also tell you the transfer doors. It’s planned as part of the system. It’s funny that in New York they refuse it.

  2. TJ

    What’s the song played in the background when Roman is describing the installation of the sign? Sounds like such a classic heist movie song that I should totally know.

    1. Scott

      They’re songs from Amon Tobin’s Supermodified album. It’s a really really great album.

  3. roman

    Hi all – I’ve listed the music we used at the end of the post. Most of it was Amon Tobin.

  4. Rich-the-reader

    The story never mentions whether Richard ever tried informing CALTRANS of the need for the extra signage (wayfinding). Seems like a logical first step to call, write or email them. If they never respond or act, consider the next step. Perhaps the transportation section of the local newspaper. If all else fails, then maybe it’s time to take matters into one’s own hands for the benefit of the public good.

  5. BKPlanner

    The reason the MTA doesn’t like the “Efficient Passenger Project” signs is because of load balance. You can dismiss it all you want, Roman, but if everyone wants to get into the same car to make a popular transfer (say the 4/5/6), then it’ll take longer than it already does to get out of the station. This will delay the whole system, all because some yahoos feel the need to get into ONE car. It’s a fantastic idea, but simply falls apart in the face of the everyday realities of the NYC subway system.

  6. Ken

    It’s also worth mentioning another approach to gorilla sign management, which as a Bay Area resident, I assume Roman knows about: the sign that indicates the turnoff from Route 1 to Bolinas, CA. Or really, the lack thereof: residents of the town have been taking it down for decades to dissuade people from discovering their little hippy village, to the point where many of them have one of the signs on display at their homes. Eventually, CalTrans stopped replacing it.

  7. There’s a group called Walk Your City that’s been hanging up signs with walking directions, and providing a tool for others to do the same. I’ve come across their signs in San Francisco a couple times recently.

    Here’s their website:

  8. I read somewhere that Caltrans doesn’t follow the MUTCD but merely uses it as a guideline for their own standards. Is this true? Of course, there was a time when the state had nothing to do with signage. It was the Auto Club that started erecting signs for the benefit of motorists.

    1. Steppy

      Some states have their own version of the MUTCD, CA is one of them . It follows the same basic rules but tailors them to CA needs.

  9. Di

    Been working on a similar issue, painting curbs red in front of fire hydrants that weren’t red before. Prevents a lot of people from parking there and getting towed/ticketed.

  10. LRJP!

    It’s a more delicate intervention and even more self-consciously an *art* project, but this story reminded me a little of Milena Bonilla’s rather lovely Transitory Map: “I randomly took several bus rides in Bogotá and sew the torn fabric of some of the buses seats. The size of the holes defined the time invested in repairing them while traveling along the city. After each journey, I highlighted the bus’s itinerary by sewing it on a map of the city, using the same thread color as the one used to sew the seat. Twenty-five tours were completed in the project and sixteen are documented.”

  11. Love 99% Invisible.
    This was a great show. Thanks for your efforts.
    Give the boys a hug and let them know every day you love them. And always back up mom, in front of the kids, even when she’s wrong. United, parents stand, divided, children fall.
    My only advice to parents.

  12. Paul

    The Seoul example of the Fast Transfers however is flawed because it revolves around knowing the carriage numbers, and the carriage numbers aren’t marked within the actual carriages. Plus, some of the listed transfers are physically impossible.

    1. Mike

      Living in Seoul for the last 5 years, fast transfers work because the carriage numbers (more specifically door numbers) are marked in front of every door. Need to transfer at Sadang from line 2 to go downtown? Just enter the train at car 5 door 2 and you’ll be right at the staircase to transfer to the light blue.

  13. Sergio de Regules

    I’ve noticed a different example of bad design, but I don’t know what can be done about it. It’s digital buttons on car stereos. With old-time analog buttons, there was one button per function (volume, bass, treble, balance) and each button could go only so far to the left or to the right. The advantage was that you could adjust the sound by touch while you kept your eyes on the road. With those stupid digital buttons, there is one single button for everything, and it goes all the way around. That makes it necessary for you to divert your eyes from the road and look at the stereo screen to check what function you are adjusting and what value it’s at at the moment. This is annoying and dangerous. Somebody please tell car stereo makers to bring back the one button-one function stereo.

  14. Anna

    I first read about the LA guerrilla sign change in Ken Jennings’ book Maphead. I was delighted to get a more thorough retelling of the story on 99PI! Reminds me of a sign giving directions to the interstate as you are leaving the St. Louis airport. (you can see it here https:[email protected],-90.368152,3a,75y,122.36h,85.6t/data=!3m4!1e1!3m2!1s05W_rkqAbhYiejnB3BYlpw!2e0 )
    The area of the sign that says “To East 70/170” hangs over the right-hand side of the fork in the road, but you actually take the left fork to get to 70/170E. I suppose MODOT thinks that since most of the sign hangs over the left fork, motorists should deduce that everything on the sign applies to the left fork, but I and others have gotten turned around a bunch of times before learning.

  15. Owen

    Everyone talks a lot about “load balance” when talking about the guerilla NYC board here transfer signs, but I think a bigger issue is information overload. Vignelli’s original designs for the subway system are masterfully simple. It only takes living in the city a little while to really understand how to traverse the subway, which is a major feat. One of the key to this is presentation of information, and I think efficient transfer signs are just overwhelming to people who don’t know how to use the subway and may already be confused. The beauty of the system in place is that presents just enough information to be understood with being utterly confusing.

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