Networks - bellevuewa/BKRCast GitHub Wiki

Network in BKRCast is a combination of Soundcast network and BKR network. Inside BKR area, the network is developed by City of Bellevue with much more details. Outside of BKR area, the network is from Soundcast. The two network were merged together to form the BKRCast network after resolving all consistency and compatibility issues.

Node

To merge Soundcast nodes (outside of BKR area) and BKR nodes (inside BKR area), we need to uniformly shift the Soundcast node ID number by +10996. The external node ID starts from 15000. Internal node ID starts from 1550. Internal BKR nodes are flagged by @bkrnode.

After merge, minor adjustments were made around the BKR boundary. The following node IDs were changed accordingly.

PSRC Nodes (+10996)	New ID in BKRCast Model
61421	7200
61570	2828
62089	4368
61814	8397
62152	9590

@bkrnode

Flag for nodes inside and outside of BKR area.

value	description
1	Bellevue
2	Kirkland
3	Redmond
4	Rest of King County
0	Outside of King County

Link

Capacity per hour per lane is stored in ul1. Speed is saved in ul2. ul3 is not in use in BKRCast.
Many link attributes are only available for BKR area. Do not apply these attributes to the external area.

Centroid Connector

Centroid connectors are set to match driveways, subject to terrain, neighborhood access and other constraints. Speed on centroid connector is always 15 mph. Its capacity is always 9999.

Capacity

Basic capacity for freeway is 1800 vphpl. Freeway capacity is defined by facility type.

Type	Type Definition	Cap (veh/ln/hr)
1	Freeways	1800
5	On Ramp not metered	1200
6	On Ramp metered	900
10	Off ramps	900
15	Fwy-fwy ramps without weaving	1500
20	Fwy-fwy ramps with weaving/conflict	1000
40	GP-HOV connection	1000

Capacity for local arterials is mainly defined by functional classification, and the adjusted by the presence of on-street parking (OSP) and center-left turn lane CLTL.

@class	Description	Basic Capacity	with OSP	with CLTL	With OSP & CLTL
10	Major arterial	1000	-200	100	-100
20	Minor arterial	800	-200	100	-100
30	collector	700	-100	100	0
40	Local	500	n/a	n/a	n/a
50	centroid connector	9999	n/a	n/a	n/a

Type

type	Description
1	Freeway
5	On ramp
10	Off ramp
15	Fwy-fwy ramp without weaving
20	Fwy-fwy ramp with weaving/confict
25	Road with center turn lanes
30	On street parking
35	Center lane + on street parking
40	GP-HOV connection
45	Centroid connector
50	Non-motorized trail
99	else

Functional Classification

@class	Description
1	freeway/ramps
10	Major arterial
20	Minor arterial
30	collector
40	Local
50	Centroid connector
60	Trail
0	Others outside of BKR area

@bkrlink

@bkrlink flags links inside and outside of BKR area.

Value	Description
0	Link outside of King County
1	Link in Bellevue
2	Link in Kirkland
3	Link in Redmond
4	Link in BKR fringe area
5	Link in rest of King County

@facility_moves

Used in emission calculation.

Value	Description
0	all roadway segments outside of King County
4	highway with restricted access (`vdf <= 3`)
5	highway open access (all other roadway segments inside King County)

Modes

All SoundCast modes are transferred to BKRCast.

Mode	Description	Type	Speed
a	Auto	auto
s	NoTollSOV	aux. auto
e	TollSOV	aux. auto
h	NoTollHOV2	aux. auto
d	TollHOV2	aux. auto
i	NoTollHOV3	aux. auto
m	TollHOV3	aux. auto
j	NoTollVans	aux. auto
g	TollVans	aux. auto
v	LgtTruck	aux. auto
u	MedTruck	aux. auto
t	HvyTruck	aux. auto
b	LocalBus	transit
p	ExpBus	transit
n	BRT	transit
r	LRT	transit
c	CRT	transit
o	StrCar	transit
f	Ferry	transit
w	Walk	aux. transit	3
x	WalkAcc	aux. transit	3
k	BikeTr	aux. transit	10
l	BikeLn	aux. transit	10
q	BikeShldr	aux. transit	10

Functions

VDF

All SoundCast VDF functions are transferred to BKRCast. A few extra were then added afterwards.
Below are VDF definitions in BKRCast.

`Name`	`Expression`
`fd1`	`put((length * 60 / ul2) * (1 + .72 * (1 * (volau + el2) / (ul1 * lanes))^7.2)) + length * (0 .max. (-0.5639 + put(get(1) / length) * (.6398 + get(2) * (-0.0712 + get(2) * (.0004 - .00009 * get(2))))))`
`fd3`	`put((length * 60 / ul2) * (1 + .56 * (1 * (volau + el2) / (ul1 * lanes))^6)) + length * (0 .max. (-0.5639 + put(get(1) / length) * (.6398 + get(2) * (-0.0712 + get(2) * (.0004 - .00009 * get(2))))))`
`fd5`	`(length * 60 / ul2) * (1 + .6 * put(1 * (volau + el2) / (ul1 * lanes))^5.8) + el1 / ((1 - get(1)) .max. .25)`
`fd6`	`(length * 60 / ul2) * (1 + 1 * put(1 * (volau + el2) / (ul1 * lanes))^5.8) + el1 / ((1 - get(1)) .max. 0.25)`
`fd7`	`(length * 60 / ul2) * (1 + .6 * put(1 * (volau + el2) / (ul1 * lanes))^5.6) + el1 / ((1 - get(1)) .max. .25)`
`fd9`	`(length * 60 / ul2)`
`fd10`	`.01`
`fd11`	`(60 * length / ul2 * (.75 - 3 * put(1 - (volau + volad) / (ul1 * lanes)) + sqrt(9 * get(1) * get(1) + 1.5625))) +((put((volau + volad) / (900 * lanes)) <= .9) * (60 / (900 * lanes - (volau + volad))) + (get(2) > 1.2) * ((((volau + volad) - (900 * lanes)) / 2) * 60 / 900) + (get(2) > .9 .and. get(2) <= 1.2) * ((9 + (get(2) - .9) / (1.2 - .9) * (.1 * 900 * lanes - 9)) * 60 / 900))`
`fd20`	`60 * length / el1`
`fd24`	`99999`
`fd31`	`ul2`
`fd40`	`ul2`

Where:

el1: @rdly
el2: transit vehicles (@trnv3)

VDFs are assigned by facility type.

Type	Type Definition	VDF
1	Freeway	fd1
5	Onramp metered	fd5 or fd11
6	Onramp not metered	fd3
10	Off ramps	fd3
15	Fwy-fwy ramps without weaving	fd3
20	Fwy-fwy ramps with weaving/conflict	fd3
25	Road with center turn lanes or sea curbs	fd3
30	On street parking	fd5
35	Center lane + on street parking	fd5
40	GP-HOV connection	fd3
45	Centroid connector	fd9
98	else & speed >= 35	fd7
99	else & speed < 35	fd5
rail links	modes = "rc"	fd40

Notes:

fd6 only applies to 148th Ave between SR520 and I90, and Bel-Red Road between 124th Ave NE and NE 20th St. fd6 is designed to add more travel cost to local arterials.
No vdf = 0 is allowed.

TTF

All SoundCast TDF functions are transferred to BKRCast.

Name	Expression
`ft4`	`(length * 60 / ul2)`
`ft11`	`1.03703 * timau .min. (length * 12)`
`ft12`	`1.28557 * timau .min. (length * 12)`
`ft14`	`1.00584 * timau`

TPF

Turn penalty functions TPF were added to the BKRCast. They are used to control turning movement flow at certain intersections. Number of turn lanes are saved in the attribute up1.

Name	Expression
`fp2`	`0`
`fp3`	`.5 + .15 * (((pvolau + pvolad) * .35 / (300 * up1 / up2)) ^ 4)`
`fp4`	`.1 + .15 * (((pvolau + pvolad) * .35 / (300 * up1 / up2)) ^ 4)`
`fp5`	`.5 + .15 * (((pvolau + pvolad) * .35 / 1600) ^ 4)`

Where:
up1: number of turn lanes. Default value is 1.
up2: capacity adjustment factor to account for exclusive right lane. Default value is 1.

Transit Lines

Transit lines running outside of BKR area are transferred from Soundcast. Transit lines running inside BKR area are updated based on the best information available. Headway for AM, MD and PM period are saved in ut1, ut2, and ut3, respectively. Headway for night period is saved in @nihdwy attribute.

Below is the method used to create transit network in the master database.

Punching out PSRC transit network and loading into excel.
Where existing PSRC network is used, the nodes were converted from PSRC node numbering to BKR version of PSRC (adding 10996 to each node number).
Route file was read in using path=no option. About 75% (or XXX routes) were successfully input. These reflect the routes which are entirely on PSRC nodes.
For the nodes from the BKR portion, we used GIS and manual efforts to set up a correspondence table between adjusted PSRC node numbers and new BKR node numbers.
Node listings not having a matching BKR node were deleted.
Route listing was read in using path=yes option.
Routes were then reviewed and modified individually based on best information available.
Routes labeled 'test' were not included.
Route labeling was converted to BKR format (eg M111-E) with PSRC numbering preserved in route descriptions.
Frequently, multiple versions of the same route and time period are listed. We chose the version with the longest route length (most complete) and used the combined headways from all versions of the route.

VEHICLES

Vehicle	Mode	Desc	AutoEq	CapS	CapT
1	b	bus	2.00	65	100
2	r	train	0.00	300	500
3	f	autoferry	0.00	1000	1000
4	f	Passferry	0.00	300	300
5	c	CmtrRail	0.00	980	1750
6	r	LightRail	0.00	300	800
7	p	CT-Loc-1	2.00	25	33
8	b	CT-Loc-2	2.00	39	51
9	p	CT-Univ	2.00	65	85
10	b	CT-Inc-1	2.00	42	55
11	b	CT-Inc-2	2.00	65	85
12	b	CT-Boe-1	2.00	39	51
13	b	CT-Boe-2	2.00	65	85
14	b	CT-Cbs	2.00	20	26
15	b	EvTran	2.00	50	65
16	b	PRC-Loc	2.00	50	65
17	b	PRC-Ex	2.00	50	65
18	b	KIT	2.00	20	30
19	b	KIT-WD	2.00	20	30
20	p	M-SmMx	2.00	37	48
21	p	M-Std	2.00	44	57
22	b	M-Std-T	2.00	44	57
23	b	M-LgMx	2.00	54	70
24	p	M-Art	2.00	65	85
25	p	M-Art-T	2.00	65	85
26	p	M-Art-D	2.00	65	85
27	b	M-Van	1.00	18	23
28	b	M-DART	1.50	18	23
29	b	M-WFSC	0.00	54	70
30	b	M-Boe	2.00	44	57

Transit Fare

Transit fare for AM and MD time periods are defined in external files located in [base_inputs]\Fares folder.

Transit fare zones are defined as follows, and saved in transit_fare_zones.grt.

Zone	Description
gt1	Seattle ride free
gt2	Seattle
gt3	King County
gt4	Everett transit
gt5	Snohomish County
gt6	Pierce County
gt7	Kitsap County
gt8	Kitsap - walk to ferry

Peak Hour Factors

We assume PM peak hour take 35% of PM peak period, and AM peak hour 38%.

PMA Zone Partition and Link Type

PMA code for zone partition and links.

Zone	Description
gc0	Outside Bellevue
gc11	Downtown
gc12	Wilburton
gc13	BelRed
gc21	Factoria
gc22	Eastgate
gc23	Crossroads
gc30	Residential