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Transcript
00:00
INSTRUCTOR: Hi there.
00:01
In this video, we will be checking and validating
00:04
potential alternatives to the existing network of our road
00:07
and highway project.
00:09
This is where we are on the overall view
00:11
of the analysis in civil engineering learning path.
00:18
Before proposing new alternatives,
00:19
we will align the model that we will
00:21
use as the base for the rest of the proposals, PO1A.
00:26
To do so, we will remove all the sources
00:28
that are not relevant to our goal, which means buildings,
00:32
city furniture, and railways, leaving the ground imagery,
00:35
the roads, and the terrain.
00:38
Cleaning out the PO1A model will allow
00:40
us to regenerate the proposals quicker,
00:42
making it easy to undo or redo our model.
00:53
Let's now switch on the TSA, focus on the TSA4,
00:57
and run the long morning simulation.
00:60
We can observe that the level of service
01:02
is not unmissable for the delay threshold allowed
01:04
by the local authorities.
01:07
All intersections have delays above 35 seconds.
01:11
This is the East intersection which
01:13
crosses the two freeways within the area,
01:15
and it has an average delay of 81 seconds.
01:19
The South intersection is the only one
01:21
that is not signalized, meaning it does not have lights
01:24
controlling the intersection.
01:26
Having into account that the initial information,
01:29
the intention of the alternatives to be proposed
01:31
is to reach a good level of service
01:33
with delays below 35 seconds.
01:36
This is the first alternative proposed, PO1A roundabout.
01:42
As you see, the West intersection
01:44
which was signalized has been replaced by a roundabout.
01:48
After running the long morning simulation
01:50
with the same demands and TSA details
01:53
that the ones used for the original PO1 proposal,
01:57
we can observe that far from reducing
01:59
the delays in the network, we have increased them by 10.
02:04
The current arrangement starts collapsing
02:06
the East intersection, forming a queue
02:09
towards the newly installed roundabout that
02:12
ends up collapsing the roundabout as well.
02:15
Once the roundabout is collapsed,
02:16
the nearby demand zones are reached by the queues,
02:20
and we can spot failures in the simulation
02:22
with cars overlapping or moving in a strange way.
02:29
Straight away, without a single doubt,
02:31
we can obviously state that the PO1A roundabout proposal is not
02:36
a feasible alternative.
02:44
The next alternative proposed is called PO1A roundabout 1.
02:49
The new proposal substitutes designalized East intersection
02:53
with another roundabout, keeping the West roundabout
02:57
from the previous proposal.
02:59
After running the long morning simulation
03:01
on our traffic simulation asset card
03:04
the simulation results displayed on the canvas
03:07
show acceptable delays and levels
03:09
of service on the TSA full network analysis.
03:13
In order to validate our findings,
03:15
let's make sure that the demand matrix data is the same on this
03:19
and the original PO1 proposal.
03:32
Now that the validation has been confirmed,
03:35
let's try to find a way to polish our proposal winner,
03:38
PO1 roundabout 1.
03:42
The intention of the PO1 roundabout proposal
03:45
is to reduce risks on this South unsignalized intersection.
03:52
Bearing in mind the arrangement you can see,
03:54
the intention is to add two auxiliary lanes--
03:58
that has been done already--
03:60
then, force the second lane from the exterior
04:03
of the road 3 North a mandatory right turn into road 9.
04:08
Then force the other two lanes of the road
04:10
to the North to only go straight because that combined will
04:15
allow it to have a freeway or a yield control to the road
04:25
To start, lets force the second lane from the exterior through
04:34
That's done.
04:35
Now we're going to open tab and check the specific and detailed
04:40
behavior of each lane.
04:44
So far, everything looks fine.
04:46
The arrows are pointing to the correct direction,
04:48
but let's check the intersection.
04:51
To start, the road
04:54
controlled by a stop sign.
04:56
Given that the two internal street
04:58
lanes of the road 3 North are splitting in 4
05:01
to the intersection, we want amend the behavior
05:04
to allow the freeway proposed for the lanes coming
05:07
from the road number 9.
05:09
Once this is done, we can enable the freeway for the road
05:15
sign for the lane turning left.
05:24
After syncing to the cloud from tap, back in Infoworks,
05:29
we can run the simulation again and check how it looks like.
Video transcript
00:00
INSTRUCTOR: Hi there.
00:01
In this video, we will be checking and validating
00:04
potential alternatives to the existing network of our road
00:07
and highway project.
00:09
This is where we are on the overall view
00:11
of the analysis in civil engineering learning path.
00:18
Before proposing new alternatives,
00:19
we will align the model that we will
00:21
use as the base for the rest of the proposals, PO1A.
00:26
To do so, we will remove all the sources
00:28
that are not relevant to our goal, which means buildings,
00:32
city furniture, and railways, leaving the ground imagery,
00:35
the roads, and the terrain.
00:38
Cleaning out the PO1A model will allow
00:40
us to regenerate the proposals quicker,
00:42
making it easy to undo or redo our model.
00:53
Let's now switch on the TSA, focus on the TSA4,
00:57
and run the long morning simulation.
00:60
We can observe that the level of service
01:02
is not unmissable for the delay threshold allowed
01:04
by the local authorities.
01:07
All intersections have delays above 35 seconds.
01:11
This is the East intersection which
01:13
crosses the two freeways within the area,
01:15
and it has an average delay of 81 seconds.
01:19
The South intersection is the only one
01:21
that is not signalized, meaning it does not have lights
01:24
controlling the intersection.
01:26
Having into account that the initial information,
01:29
the intention of the alternatives to be proposed
01:31
is to reach a good level of service
01:33
with delays below 35 seconds.
01:36
This is the first alternative proposed, PO1A roundabout.
01:42
As you see, the West intersection
01:44
which was signalized has been replaced by a roundabout.
01:48
After running the long morning simulation
01:50
with the same demands and TSA details
01:53
that the ones used for the original PO1 proposal,
01:57
we can observe that far from reducing
01:59
the delays in the network, we have increased them by 10.
02:04
The current arrangement starts collapsing
02:06
the East intersection, forming a queue
02:09
towards the newly installed roundabout that
02:12
ends up collapsing the roundabout as well.
02:15
Once the roundabout is collapsed,
02:16
the nearby demand zones are reached by the queues,
02:20
and we can spot failures in the simulation
02:22
with cars overlapping or moving in a strange way.
02:29
Straight away, without a single doubt,
02:31
we can obviously state that the PO1A roundabout proposal is not
02:36
a feasible alternative.
02:44
The next alternative proposed is called PO1A roundabout 1.
02:49
The new proposal substitutes designalized East intersection
02:53
with another roundabout, keeping the West roundabout
02:57
from the previous proposal.
02:59
After running the long morning simulation
03:01
on our traffic simulation asset card
03:04
the simulation results displayed on the canvas
03:07
show acceptable delays and levels
03:09
of service on the TSA full network analysis.
03:13
In order to validate our findings,
03:15
let's make sure that the demand matrix data is the same on this
03:19
and the original PO1 proposal.
03:32
Now that the validation has been confirmed,
03:35
let's try to find a way to polish our proposal winner,
03:38
PO1 roundabout 1.
03:42
The intention of the PO1 roundabout proposal
03:45
is to reduce risks on this South unsignalized intersection.
03:52
Bearing in mind the arrangement you can see,
03:54
the intention is to add two auxiliary lanes--
03:58
that has been done already--
03:60
then, force the second lane from the exterior
04:03
of the road 3 North a mandatory right turn into road 9.
04:08
Then force the other two lanes of the road
04:10
to the North to only go straight because that combined will
04:15
allow it to have a freeway or a yield control to the road
04:25
To start, lets force the second lane from the exterior through
04:34
That's done.
04:35
Now we're going to open tab and check the specific and detailed
04:40
behavior of each lane.
04:44
So far, everything looks fine.
04:46
The arrows are pointing to the correct direction,
04:48
but let's check the intersection.
04:51
To start, the road
04:54
controlled by a stop sign.
04:56
Given that the two internal street
04:58
lanes of the road 3 North are splitting in 4
05:01
to the intersection, we want amend the behavior
05:04
to allow the freeway proposed for the lanes coming
05:07
from the road number 9.
05:09
Once this is done, we can enable the freeway for the road
05:15
sign for the lane turning left.
05:24
After syncing to the cloud from tap, back in Infoworks,
05:29
we can run the simulation again and check how it looks like.
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