Additional Shields of Mexico City

[claysmalley]

Mexico City's ejes viales were described in #405 and implemented in #1098. These are the most prominently signed routes, although official government documents show shield designs for some other major highways.

Page 97 shows the designs for viaductos, the Circuito Interior, the Anillo Periférico and radiales:

Pages 114 and 115 indicate that the shield orientation for the Periférico and radiales is different for each route in the network:

A suggested relation-based tagging scheme for these routes would be:

Route name	network	ref
Viaducto C	MX:CDMX:VDCTO	C
Circuito Interior	MX:CDMX:CTO
Anillo Periférico N1	MX:CDMX:PERIF	N1
Radial 3	MX:CDMX:RADIAL	3

[claysmalley]

Some more context from an exchange between me and ezuplkqrhp:

The manual also includes local ‘highways’ such as Anillo Periférico, Circuito Interior, Radiales, and Viaductos, each with their own logo and reference code. However, these are rarely seen. As a local, I can confirm they are seldom utilized, but occasionally a sign will feature them. So, they are indeed official, but for some reason, local governments don’t frequently use signs with these logos.

…

Even if the shields for these local highways are uncommon on the ground, would an average Chilango expect to see them on maps?

No, not really. Perhaps only for Anillo Periférico or Circuito Interior, but not typically. Ejes Viales are far more prevalent, culturally significant, and widely recognized, having shaped the city’s history and identity. Most people are unaware of Radiales or that there are four Viaductos, commonly referring to a single, prominent one. Anillo Periférico is perceived as a highway mainly in its southern, motorway-like section, whereas it fragments into regular commuter streets elsewhere. You can even see it on Google Maps, where only Ejes Viales have reference codes - you know, those little blue rectangles.

But anyway, that’s just my opinion. Others may have different experiences or views, so it may be worth hearing from the community to get a better picture.

I'd say these routes are a low priority. Perhaps we can revisit this in a few years, if signage becomes more prevalent and these icons enter the public conscience.