Either measurements are much better, or volumes have dropped off by a lot along 17th Ave as it became more of a destination. I suspect both. 2 traffic lanes is more than adequate today, though left turn bays in strategic locations are likely needed to keep flow. 2 lanes and a narrow parking lane (more like a stopping lane for service/delivery/pickup/taxi/uber with a couple of very pricey parking spots) would be my choice.
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Wow - I had no idea volumes are down 40-50% the past 25 years. I wonder if we tracked pedestrian volumes would you see the inverse?
One issue with some of the transportation data is that studies typically look at only weekday, rush hours counts. The logic for this is fairly simple - weekday rush hours are likely peak road demand and congestion, so therefore if you measure the traffic counts during peak, upgrade the road to accommodate the highest volume, you'll have enough capacity at all other times.
For streets with other functions than commuting, like 17 Avenue, this is a major disadvantage as it's only a small fraction of the story about how the street works and what capacity needs to be planned for. Rush-hour based counts favour driving and car capacity. It doesn't count Saturday afternoon walking traffic or evening traffic where pedestrian counts (and therefore the sidewalk capacity needed) is the highest.
At a basic fairness perspective, if the logic is to build our roads to meet peak capacities, surely we should be mode agnostic - shouldn't we at least try to count pedestrian demand peaks and request space in the road for that? A step further into the strategic direction - we have a transportation sustainability triangle that helps inform which mode is better to enable, pedestrians being higher.
That's what I am talking about in lacking mechanisms to match pedestrian demand and sidewalk capacity - we see a prolonged collapse in car travel demand, roadway stays the same, despite measurable drop in traffic. No idea if that kind of thing factored into the 2017 - 202X rebuild project, but the decline in car demand should have been a visible trend when that project was imagined.
At the same time, if we counted pedestrian peaks, we would see a prolonged increase in pedestrian demand (my hypothesis). But we don't count it. If we did we would only count rush hours - important but not peak pedestrian traffic.
Taken together that's the disconnect - roads are design for driving capacity and demand, but only ratchet upwards - decreases in demand don't lead to available capacity being freed up easily or often. Pedestrian demand is anecdotal and disconnected from capacity planning. Even if we did know the counts, it's not clear that would/could influence capacity and design outcomes.