
There has been a recurrent interest expressed here in having Bike Lanes on Ross Avenue, and so that's a good test case to look at.
Ross Avenue is 1.75 miles long, from Greenville Avenue to Central Expressway, and another 1.2 miles from Central to Houston Street. Let's discuss the section from Greenville to Central, first. That section of Ross is 56' wide, with 11' wide through lanes, and with a center turn lane of 12'.
A bike lane should be 5' wide according to the AASHTO Guide that the vast majority of public agencies use (there are exceptions), including 4' for the lane itself and a 1' offset from the curb, to avoid the worst of the problems that occur along road edges, including the very dangerous to bicycles seam between the gutter pan and the actual road pavement. To install a bike lane in both directions (5'x 2), one travel lane would have to be removed from Ross. Would you remove the center turn lane, forcing all left turning vehicles to block traffic (adding to air pollution due to increased idling, and increasing rear-end collisions)?
Or would you remove 2' from each lane? That would result in 9' travel lanes... the same width as many of the trucks and buses that are on the road, resulting in frequent sideswipes, and truck mirrors protruding into the bike lane.
The section from Greenville to Central has approximately 18 street intersections and 60 commercial driveways per side. This sets up the high probability of frequent right-hook collisions, where a right turning vehicle (turning either onto a cross street, or entering a commercial driveway) strikes a cyclists they can't see (in the driver's blind zone). Additionally, there are numerous sections of Ross Avenue that have either parallel parking (door zone dangers) and head-in parking (another danger to bike-lane constrained cyclists when vehicles begin backing out, or pulling in unexpectedly).
One option would be to widen the street. That would mean tearing down every street-side building along Ross, or eliminating the sidewalks completely, neither of which strike me as a terribly good solution, not to mention the astronomical expense of buying private property.
If a cyclist chose Ross Avenue for their commute, the safest, and most environmentally responsible way to do so is to ride in the middle of the travel lane (as allowed by law). Sounds scary to some, but I believe there have been offers here to show one how easy it is to do.
For the cyclist who just can't face Ross Avenue during rush hour (no shame here, especially for the inexperienced), there are other, less congested options. San Jacinto, Bryan, Munger, Swiss, and even Gaston Ave and Live Oak, are all excellent ways to get from East Dallas/Lower Greenville, into the CBD. It may require you to ride a couple blocks out of your way to get across Julius Schepps and the DART line, but it's only a couple of blocks at most.
So, those of you who want bike lanes on Ross Avenue, what's your suggestion? More pollution? More traffic jams? More accidents? This is one inescapable reality of the streetscapes in Dallas, although once you learn the simple skills of vehicular cycling, it's not a bad one.
The other inescapable reality is this: just as there is no Magick Paint that keeps cars out of bike lanes, there's also no Magic Wand that creates new right of way.