Headed north on 5 today, merged on to 580West. Just before it merges into I-205, there is a sign that says I-580 bypass, trucks must exit"
Waze sent me on this "bypass" and its just a big, one lane ramp swooping from 580, over 205 and back to 580.
What is the intention of this bypass? Why must trucks exit? Does it really work ?
https://www.google.com/maps/@37.7378631,-121.5556927,3a,75y,275.74h,91.88t/data=!3m7!1e1!3m5!1s7ikpRfkKrJ5URQTyb7FESg!2e0!6s%2F%2Fgeo2.ggpht.com%2Fcbk%3Fpanoid%3D7ikpRfkKrJ5URQTyb7FESg%26output%3Dthumbnail%26cb_client%3Dmaps_sv.tactile.gps%26thumb%3D2%26w%3D203%26h%3D100%26yaw%3D255.98907%26pitch%3D0%26thumbfov%3D100!7i16384!8i8192 (https://www.google.com/maps/@37.7378631,-121.5556927,3a,75y,275.74h,91.88t/data=!3m7!1e1!3m5!1s7ikpRfkKrJ5URQTyb7FESg!2e0!6s%2F%2Fgeo2.ggpht.com%2Fcbk%3Fpanoid%3D7ikpRfkKrJ5URQTyb7FESg%26output%3Dthumbnail%26cb_client%3Dmaps_sv.tactile.gps%26thumb%3D2%26w%3D203%26h%3D100%26yaw%3D255.98907%26pitch%3D0%26thumbfov%3D100!7i16384!8i8192)
Similar to the CA-99's southern terminus. When approaching the terminus on I-5 south, theres a truck bypass. The truck bypass remains on the ground while cars use a flyover over CA-99 as it merges with I-5
Quote from: jander on April 07, 2019, 10:25:02 PM
Headed north on 5 today, merged on to 580West. Just before it merges into I-205, there is a sign that says I-580 bypass, trucks must exit"
Waze sent me on this "bypass" and its just a big, one lane ramp swooping from 580, over 205 and back to 580.
What is the intention of this bypass? Why must trucks exit? Does it really work ?
https://www.google.com/maps/@37.7378631,-121.5556927,3a,75y,275.74h,91.88t/data=!3m7!1e1!3m5!1s7ikpRfkKrJ5URQTyb7FESg!2e0!6s%2F%2Fgeo2.ggpht.com%2Fcbk%3Fpanoid%3D7ikpRfkKrJ5URQTyb7FESg%26output%3Dthumbnail%26cb_client%3Dmaps_sv.tactile.gps%26thumb%3D2%26w%3D203%26h%3D100%26yaw%3D255.98907%26pitch%3D0%26thumbfov%3D100!7i16384!8i8192 (https://www.google.com/maps/@37.7378631,-121.5556927,3a,75y,275.74h,91.88t/data=!3m7!1e1!3m5!1s7ikpRfkKrJ5URQTyb7FESg!2e0!6s%2F%2Fgeo2.ggpht.com%2Fcbk%3Fpanoid%3D7ikpRfkKrJ5URQTyb7FESg%26output%3Dthumbnail%26cb_client%3Dmaps_sv.tactile.gps%26thumb%3D2%26w%3D203%26h%3D100%26yaw%3D255.98907%26pitch%3D0%26thumbfov%3D100!7i16384!8i8192)
I think it's because the mainline merges on the left side of the I-205 mainline. California has a law that restricts trucks to the right two lanes of a freeway by default (unless otherwise marked). So if the trucks used the mainline instead of the bypass, they end up in lanes 1 or 2 on a 5-lane mainline in violation of this law. The bypass comes in on the right after the merge, keeping the trucks in compliance.
It seems like the bypass would also help in keeping slower traffic to the right after the merge. Also, the bypass allows easier access to the exit just downstream.
Quote from: roadfro on April 07, 2019, 11:11:13 PM
Quote from: jander on April 07, 2019, 10:25:02 PM
Headed north on 5 today, merged on to 580West. Just before it merges into I-205, there is a sign that says I-580 bypass, trucks must exit"
Waze sent me on this "bypass" and its just a big, one lane ramp swooping from 580, over 205 and back to 580.
What is the intention of this bypass? Why must trucks exit? Does it really work ?
https://www.google.com/maps/@37.7378631,-121.5556927,3a,75y,275.74h,91.88t/data=!3m7!1e1!3m5!1s7ikpRfkKrJ5URQTyb7FESg!2e0!6s%2F%2Fgeo2.ggpht.com%2Fcbk%3Fpanoid%3D7ikpRfkKrJ5URQTyb7FESg%26output%3Dthumbnail%26cb_client%3Dmaps_sv.tactile.gps%26thumb%3D2%26w%3D203%26h%3D100%26yaw%3D255.98907%26pitch%3D0%26thumbfov%3D100!7i16384!8i8192 (https://www.google.com/maps/@37.7378631,-121.5556927,3a,75y,275.74h,91.88t/data=!3m7!1e1!3m5!1s7ikpRfkKrJ5URQTyb7FESg!2e0!6s%2F%2Fgeo2.ggpht.com%2Fcbk%3Fpanoid%3D7ikpRfkKrJ5URQTyb7FESg%26output%3Dthumbnail%26cb_client%3Dmaps_sv.tactile.gps%26thumb%3D2%26w%3D203%26h%3D100%26yaw%3D255.98907%26pitch%3D0%26thumbfov%3D100!7i16384!8i8192)
I think it's because the mainline merges on the left side of the I-205 mainline. California has a law that restricts trucks to the right two lanes of a freeway by default (unless otherwise marked). So if the trucks used the mainline instead of the bypass, they end up in lanes 1 or 2 on a 5-lane mainline in violation of this law. The bypass comes in on the right after the merge, keeping the trucks in compliance.
It seems like the bypass would also help in keeping slower traffic to the right after the merge. Also, the bypass allows easier access to the exit just downstream.
Yes all of what you say is true. Even though they are known as truck bypasses what I know they are allowed to be used by cars as well. The point is to allow For trucks to stay towards the right.
Most interchanges don't have bypass Lanes. And those circumstances trucks are allowed to be on the left until they can safely merge usually within about half a mile. in the LA area you may come and get me see some signs that say "trucks ok" around interchanges that serve this purpose.
Nexus 5X
This "bypass" used to be the mainline I-580 was until a recent project moved the mainline to merge from the left side of I-205.
This ramp was kept in place so cars can safely exit Grant Line Road and keeping trucks on the right (as others have said).
Caltrans D8 did a similar thing with the I-15/215 Devore "split" in order to keep NB trucks to the right prior to heading up the hill to Cajon Pass, and conversely to keep trucks coming down that same steep hill well to the right so SB cars on I-15 can safely exit to I-215.
Quote from: mrsman link=topic=24825.msg2408698#msg2408698
in the LA area you may come and get me see some signs that say "trucks ok" around interchanges that serve this purpose.
Or see trucks using the No. 1 and 2 lanes anyway.