This would only be true if additional lanes were built on top of each other instead of next to each other. As lanes are widened though they just keep pushing things apart and making other types of transit less pleasant, which will then create demand that wasn't there before (because people now need to be on roads longer to get where they want to go). There is a maximum density that cars can support that is LOWER than most cities are built up at.
You've totally misunderstood induced demand. You can build unlimited roads and they will all be used up and commutes will increase for everyone.
People engineer cities and development around transit. If you provide massive amounts of transit to a desirable location people will saturate it.
This is why initially highway projects look like successes. Wow. My commute is so much better. And then. In a decade. They're even worse than they were originally.
>People engineer cities and development around transit. If you provide massive amounts of transit to a desirable location people will saturate it.
well yes, that is the objective of building transit[0]: to get people where they would like to go. That people 'induce demand' by moving to a place where they can go where they would like to go with (initially) less friction is the system reequilibrating - from places where demand was not adequately sated[0].
Consider the opposite situation: we remove one lane from all highways, and drop the speed limits on all surface streets by 25 percent, and reduce the departures of all trains and planes by 25%. If adding capacity is bad, then reducing it must be good [for the economy and people's quality of life].
[0]If demand was adequately sated, where was it induced from? Adequately sated here might also be read as 'optimally sated' or even just 'less well sated'. Obviously there is a point where cost exceeds the marginal benefit, e.g. adding 10 new bay bridges would surely reduce mean transit times across the bay, but at a patently unreasonable cost-benefit ratio.
[1]Unless you like to argue that we are at the local or global optimum for transit capacity?
It's not that adding capacity is bad, that it can be ineffective.
Given that personal transport is such a large percentage of the nations' carbon footprint, adding more cars detracts from that goal. From that perpsective, or a localized pollution perspective, or people wasting time in traffic jams (because NO alternative exists) - those are bad things.
I've generally lived in places in the US where driving is the ONLY viable option. By adding lanes, an ineffective tactic, instead of investing in more scalable (ie: effective) solutions - therein lies a problem.
> well yes, that is the objective of building transit
The US traffic engineer currently tries to optimize for throughput as defined by vehicles per minute, rather than passengers per minute. Therein lies the rub. Take a 2 lane road, dedicate one for buses, and it turns out the passenger throughput per minute goes way up, a single bus can be equivalent to 50+ cars.
Which is all to say, build more lanes of road for single occupancy cars has a limiting factor for when that is no longer an effective solution to the transit problem. Yet, adding more lanes is often still the only solution applied in many jurisdictions.
in some cities where traffic was reduced in specific areas (usually the center), business went up, because, as more people were forced to walk, they also were more spontaneously entering shops and buying more.
But it will increase. People move farther away ("this commute used to be bad but now there's another lane so I can live in a bigger house further out!"), businesses build "enough" parking so things are spread farther apart, and all of this increases the miles driven, thereby increasing traffic.
No, there is no such point, because there is simply not enough room to transport every person in an office building or high-rise apartment building in a personal car to and from work.
Imagine if there was a portal on your front lawn that allowed you instant access to downtown London. How much more frequently would you travel to London if it took you literally no time at all? All of those trips are induced demand--that is, it is extra demand that is induced by the ease of the trip. Shifting demand from one route to another is, by definition, not induced demand, since it already existed!
Every time you decide to delay a trip during rush-hour, because of rush-hour - that is an example of what you are describing.
As an example, in Bellevue, Washington - the evening rush hour starts (and is really bad) at 3pm - there are that many people leaving work progressively earlier that there is still a rush hour of people leaving work early to avoid the big rush-hour.
More lanes only helps the car manufacturers. A nice train system up and down the front range would be great. Would also help people get their 10,000 steps in every day walking to the train.
People are already complaining about traffic! Drivers taking I70 between Denver and Loveland on weekends aren't doing so because of their love of the road. Why would we want to increase the number of people experiencing traffic? To assume my prior hyperbolic tone: Widening roads is punishing people for driving!
I'd argue the true goal of the exercise is to increase the capacity of the transit system, and that includes the proposal to not widen the roads. This isn't being done to punish drivers, regardless of how someguydave wants to frame it. The money (to the tune of a cool billion dollars) is being reinvested elsewhere in the network with the intent of increasing the number of people the city can move. The naive proposal of widening roads does work! It increases capacity, but it also makes everybody's experience worse via traffic and pollution. Let's see if there's something better!
People complain about everything. Certainly the bus is a common complaint here in Chicago even though it’s difficult for me to imagine it getting much better. Even if they add BRT people will complain about that. Of course the goal is increasing capacity of the transit system the question is how to do it.
I think the US has a big problem where SFHs are the epitome of what it means to be successful for a huge number of people. These people will always vote for policies that enable living in a single family home, even if they don’t live in on themselves and will never be able to afford to because the freedom to do so is so deeply ingrained. Highway expansion is a policy that enables single family home living as it enables people to live farther and farther from the city center so I suspect it will always see a large amount of political support.
Roads are widened all the time with the goal to increase average speeds.
I can think of counter-example where it's more clear that travel time is not an independent variable to road width:
- lanes on highways are extra wide so you drive faster. (The wider the lane, the faster people will drive, the margin of error is greatly reduced allowing a faster travel speed). If what you were saying is true, then there would be first a lot of projects to narrow lanes to the minimum in order to increase the number of travel lanes. IIRC, US highways have as a standard a 13 foot width (I might have that somewhat wrong), IIRC as well, the absolute minimum width is more like 9 feet. There could be almost 50% more lanes by narrowing, but that would reduce traffic speeds.
