This is a repurposing of a famous flag of defiance flown by Texans as part of the Texas revolution against Mexico.
https://en.m.wikipedia.org/wiki/ComeMexico.https
The poster has redesigned the sign to say that their local government can come and take their bicycles and bicycle infrastructure. This this is a meme for bicycle infrastructure using a language that is easily recognized by people who would be anti-bicycle. This is part of a series of memeworks this poster has shared twisting generally reactionary talking points to "trick" or persuade would be reactionaries to being pro anti-car.
One thing to note, aside from all the other inconsistencies, that tracking number does not follow the standard tracking number format for a USPS package. The USPS website describes their different tracking numbers for their different services in the FAQ at the bottom of their tracking page. https://tools.usps.com/go/TrackConfirmAction_input