3 ms·

How does a tunnel eliminate traffic? That doesn't make any sense.

ggregoire 10y ago
I'm not a civil engineer but I'd say it works because you distribute the traffic? Before building the tunnel: - city = 100% traffic After building the tunnel: - city = 50% traffic - tunnel = 50% traffic Edit: seems to be a "traffic flow" problem, https://en.wikipedia.org/wiki/Traffic_flow https://en.wikipedia.org/wiki/Traffic_flow
- city41 10y ago
  Isn't this similar to adding lanes to freeways? I was always under the impression that actually makes traffic worse, like this article suggests: https://www.wired.com/2014/06/wuwt-traffic-induced-demand/ https://www.wired.com/2014/06/wuwt-traffic-induced-demand/
  - zardo 10y ago
    We can let traffic get so bad it reaches an equilibrium that stiffles the growth of the region by preventing movement, or continue to expand capacity indefinitely.
  - sparky_z 10y ago
    It's more like adding a new road. You can't "change lanes" between the tunnel and the freeway.
    - city41 10y ago
      I'm a complete novice when it comes to road infrastructure so I really have no idea. But I always thought the argument was expanding road capacity just caused more people to consider using it and it always naturally expanded to the point of congestion regardless of size. I'd think a road plus a tunnel would have a similar effect.
  - coss 10y ago
    have you ever been in a traffic accident on the freeway? It blocks up every lane. Whereas a completely different route can still proceed unaltered. Also, splitting up the traffic should theoretically reduce accidents.
    - city41 10y ago
      Sure, but in my experience accidents are very rare compared to the total. I don't live in LA, and my evidence is anecdotal, but I'd be willing to bet that overall accidents have minimal impact on a road's throughput.
SlipperySlope 10y ago
The LA freeway system never completed its original rational design. As a result a vehicle must take a round-about path to get from one place to another. Musk's tunnel would be a direct express route between popular endpoints.
dalfonso 10y ago
Maybe he plans on privatizing the tunnels? Those willing to pay can use the tunnels, the rest use public roads.

I'm not a civil engineer but I'd say it works because you distribute the traffic? Before building the tunnel: - city = 100% traffic After building the tunnel: - city = 50% traffic - tunnel = 50% traffic Edit: seems to be a "traffic flow" problem, https://en.wikipedia.org/wiki/Traffic_flow https://en.wikipedia.org/wiki/Traffic_flow

city41 10y ago
Isn't this similar to adding lanes to freeways? I was always under the impression that actually makes traffic worse, like this article suggests: https://www.wired.com/2014/06/wuwt-traffic-induced-demand/ https://www.wired.com/2014/06/wuwt-traffic-induced-demand/
- zardo 10y ago
  We can let traffic get so bad it reaches an equilibrium that stiffles the growth of the region by preventing movement, or continue to expand capacity indefinitely.
- sparky_z 10y ago
  It's more like adding a new road. You can't "change lanes" between the tunnel and the freeway.
  - city41 10y ago
    I'm a complete novice when it comes to road infrastructure so I really have no idea. But I always thought the argument was expanding road capacity just caused more people to consider using it and it always naturally expanded to the point of congestion regardless of size. I'd think a road plus a tunnel would have a similar effect.
- coss 10y ago
  have you ever been in a traffic accident on the freeway? It blocks up every lane. Whereas a completely different route can still proceed unaltered. Also, splitting up the traffic should theoretically reduce accidents.
  - city41 10y ago
    Sure, but in my experience accidents are very rare compared to the total. I don't live in LA, and my evidence is anecdotal, but I'd be willing to bet that overall accidents have minimal impact on a road's throughput.

SlipperySlope 10y ago

The LA freeway system never completed its original rational design. As a result a vehicle must take a round-about path to get from one place to another. Musk's tunnel would be a direct express route between popular endpoints.

dalfonso 10y ago

Maybe he plans on privatizing the tunnels? Those willing to pay can use the tunnels, the rest use public roads.