7:102. Posting notices prohibited.
No person shall paint, post, or in any way affix any notice, banner, poster or other paper or device on:
(1) Any lamp post, public utility post or shade tree within the limits of any public way or on any public structure, building, improvement or appurtenance thereof, including, but not limited to, refuse containers, fences, parking meters, traffic signs and poles, and hydrants, nor cause the same to be done, except as may be authorized or required by law; or
(2) Any tree, post, fence, building, improvement, appurtenance or property not his own, nor cause the same to be done, without the express permission of the owner unless authorized or required by law.
(3) Notwithstanding the foregoing provisions of this section, it shall not be a violation of this section for a person to place a poster on a utility pole or lamp post within a public right-of-way if the following conditions are met:
(a) The poster contains a date not more than 14 days following the placement of the poster. The date of an event advertised in a poster may be used to comply with this subsection.
(b) The person affixing the poster shall remove at least 5 outdated or undated posters from the same post or remove all of the outdated or undated posters if there are fewer than 5.

Here’s the punishment.

7:106. Penalties.
Except as otherwise provided in this section, each violation of this chapter shall be a misdemeanor punishable by a fine of not more than $500.00 and costs of prosecution or by imprisonment for not more than 90 days, or by both such fine and imprisonment. Sections 7:93, 7:102, 7:103, and 7:104 shall be a civil infraction punishable by a civil fine of not less than $200.00 and up to $1,000.00, plus costs and all other remedies available by statute. Each day of violation shall be a separate violation. If the penalty for sections 7:93 and 7:103 is not paid within 45 days, it may be assessed against the parcel under section 1:292 of this Code.

What is not clear to me based on the ordinance is if it’s unlawful to remove a poster that’s been affixed legally. I recall a 2005 thread on AnnArborisOverrated where some measure of frustration was expressed about posting fliers and having them instantly removed, by a self-appointed enforcer of light-pole aesthetics: [link]