Quote:
Originally Posted by CliffFletcher
In numbers, sure. But Southland @ 14th street is a four-way intersection, while 90th @ 14th street is a T intersection. I’m not a traffic engineer, but I’d assume a four-way intersection with eastbound traffic going 40/40/20 left/straight/right has better flow than a T intersection with an 80/-/20 split.
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A 4-way intersection like Southland/14th has 4 signal movements. Probably closer to 35/15/35/15 (minus a percent or two between each change).
The T has 3 (you could kinda say 2.5 at 90th since NB-NB gets a green while NB-WB. It could be more like 45/15*/40 (NB-NB would be 60%)
I'm not sure what the actual timing is like, but I'm pretty sure I've never had a multi-light wait for any movement at that intersection. It just 'feels' slow to make two consecutive LH turns in short order to get from Glenmore Landing to NB 14th
Quote:
Originally Posted by Slava
This doesn’t seem right. The Southland and 14th intersection has 5 lanes (I’m just going from memory?). Heading easterly, there is one that goes south, two to make the left hand turn and two to continue east. At 90th, there are three; two to turn north onto 14th and one to go south. The capacity can’t be the same.
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90th has a triple LH turn lane for EB to NB. No movement at Southland/14 has more than 2 lanes.
You can tweak the timings however you'd like within reason and 90th/14th will almost certainly have higher throughput for each movement than the equivalent at Southland.