Select one of them and head up to Edit > Select Same > Fill and Stroke, then press Delete. It may look like all of the text is gone, but a little zooming will reveal these nasty white text outlines. Bam! A whole megabyte of symbols gone! Make sure to save before you close out. We don’t need any of it, so I just shift+clicked from the and again to the and hit Delete. Thankfully, Brackets has the ability to collapse this whole group, because there’s some 10,000+ lines of it. Below, I’m using Brackets to find the start of the symbols group (around line 50). The best way I’ve found to remove all of these at once is to open the SVG in a text/html editor and remove the symbols group manually. It looks like uses an absolute ton of symbols for the text, which makes the SVG file gigantic. With that part cleaned up, I was wondering if somebody would possibly want to remove all of these street names (they do look pretty dingy). Now we can just hit Delete (what a cool feature, by the way.)

First, select one of these purple lines and head up to Edit > Select Same > Stroke Color which will select all of them.

Inkscape vectorize giving double lines