That tweet is showing how many more people can travel along a corridor if there are bus specific lanes. Cars may not be able to move much faster, but people surely do (according to the tweet only)
The article you posted referenced a study which came out in 2015, only a year after construction was completed. I wonder how it's working for them in 2019? Here's some counterpoint:
Five years after Sepulveda Pass widening, travel times on the 405 keep getting worse
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Average drive times through the Sepulveda Pass have stayed the same or increased at all hours of the day
"Metro argued in 2015 that the widening project had cut down overall hours of delay by 37 percent, compared to how long drivers would have spent in traffic if the project had never been constructed."
"For four years, from 2015 to 2019, Inrix measured the length of commutes along the widened stretch of the 405 during a four-week period between January and February. In that time, average commutes in both the north and southbound directions worsened or stayed the same during all hours of the day. Average vehicle speeds also dropped or stayed the same during both peak- and non-peak-hour periods."
"Drivers traveling north between 3 and 4 p.m. experience the most additional delay, with average speeds having dropped from 28 miles per hour in 2015 to 19 miles per hour in 2019. The result of that is an almost 50 percent increase in total travel time, from 23 minutes in 2015 to 34 minutes in 2019."
So yes, widening that highway seemed to help in the short term but it seems as though induced demand strikes again like it does almost every time.
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