Simplification protocol

ID	Situation	Description	Examples (coords)	Goal
1*	Dual carriageway	Two parallel roads going in the same direction	9,7044077°E 4,0379723°N
2*	Dual carriageway at T intesrsection	Two parallel roads going in the same direction, meeting another centerlne	37,0688668°E 36,3168507°N
3*	A diverging road	Two Roads meeting at intersection and are connected with another	37,0683693°E 36,3143588°N
4*	A cross shaped intersection	Two perpendicular roads diverging and crossing each other	9,7410638°E 4,0968701°N
5*	Roundabouts1	Two parallel roads going to a roundabout which in fact is not a roundabout	37,0530301°E 36,3183232°N
6*	Roundabouts2	Two parallel roads going to a roundabout which only has 2 roads going from it	37,0531538°E 36,3195563°N
7*	A diverging road	A single carriageway that diverged and then converged again	9,8034526°E 4,0220604°N
8*	Connecting roads	Two parallel roads connected by smaller roads	37,0547084°E 36,3126666°N
9*	T intersection	Two parallel roads forming a T intersection	37,0550627°E 36,3096529°N
10*	intersection	Four parallel roads forming an intersection	37,0659947°E 36,3105479°N
11*	A roundabout	A roundabout connecting four carriageways	9,8224080°E 4,0152036°N
12*	Roundabout 3	Parallel roads and single roads going to a roundabout	37,0490733°E 36,2917144°N
13*	A roundabout	A roundabout connecting multiple carriageways, which also need to be collapsed	9,8213187°E 4,0098569°N
14*	intersection	Parallel roads and single roads going to an intersection	37,1531962°E 36,2277218°N	![image]
15*	A dual carriageway	A dual carriageway with multiple intersecting single carriageways	9,8198052°E 4,0024864°N
16*	A triangular intersection	A triangular intersection	9,7490791°E 3,9728517°N
17*	Roundabout	Parallel roads and single roads going to a roundabout	37,0491355°E 36,2917279°N
18*	A bell shaped diverging carriageway	The divergent carriageways are connected with a road	9,7268229°E 4,0719848°N
19*	Link roads		37,1398569°E 36,2401153°N
20*	A highway	A highway	9,5864468°E 4,1188767°N
21*	Intesrsection	4 singe roads forming a squareabout	37,1427047°E 36,2365752°N
22*	Difficult Intesrsection	Multiple road with links forming an intersection	37,1591607°E 36,2246981°N
23*	Difficult Intesrsection	Multiple road with links forming an intersection	37,1647140°E 36,2196287°N
24*	Triangleabout	Multiple roads forming an triangleabout	37,1687482°E 36,2154849°N
25*	A roundabout	A roundabout on a triple carriageway	9,6470189°E 4,0946625°N
26*	A roundabout	A roundabout on a triple carriageway	9,6543114°E 4,0959725°N
27*	Yet another roundabout	A roundabout on a triple carriageway	9,6609865°E 4,0900483°N	No change suggested
28*	T intersection w links	T intersections with parallel roads and links	37,1631709°E 36,2009686°N
29*	A fork-like carriageway	A fork-like carriageway	9,6611711°E 4,0880919°N
30*	A diverging road under a dual carriageway	The road diverges under a dual carriageway	9,7163674°E 4,0672264°N
31*	Ovalabout	Ovalabout with parallel roads	37,1680681°E 36,1939477°N
32*	A big roundabout	The roundabout is big	9,7341259°E 4,0855346°N
33*	A diamond-shaped intersection	A diamond-shaped intersection	9,7410767°E 4,0897674°N
34*	A kraken-shaped intersection	The roundabout is above the dual carriageway	9,6905216°E 4,0429631°N
35*	A dual carriageway intersection	A single carriageway is below a dual carriageway	9,6902833°E 4,0309899°N
36*	Multiple road intersection	triple road forming an intersection	37,2292518°E 36,1859130°N
37*	Diverging carriageways and a roundabout	The carriageways diverge and form a roundabout	9,6831816°E 4,0327779°N
38*	A triangular intersection	A triangular intersection	9,6809973°E 4,0383909°N
39*	8 intersection with double roads	…	37,1084284°E 36,2271911°N
40*	cul de sac	…	36,9760168°E 36,1273910°N
41*	Two roundabouts separated by nature	The carriageways are too far apart to collapse them	9,6903753°E 4,0476842°N
42*	roundabout with roads on different levels	you cant get from one place to another	37,1797839°E 36,2086177°N
43*	roundabout with roads on different levels	you can get from one place to another	37,1808669°E 36,2131919°N
44*	alien intersection with roads on different levels	you cannot get from one place to another and there is also a barrier which you cant cross	37,1526263°E 36,2149223°N
45*	note shaped intersection	you can get from all places to all places	37,1957904°E 36,2128309°N
46*	8 shaped intersection	there are roads connected to onelink road	36,9912088°E 36,0967749°N
47*	multilevel intersection	you can get from all places to all places
48*	road that is getting wider and wider	the treshold for not merging the roads was set to25 m, but it can differ from city to city and place to place, so itsnot an optimal solution
49*	clover leaf intersection	you can get everywhere
50*	A roundabout	A roundabout	9,7010919°E 4,0612104°N
51*	cloverleaf intersection that actually does not exist	it was never built	37,1655761°E 36,1585728°N
52*	multilevel intersection with a bridge	there is a bridge	37,1454283°E 36,1591090°N
53*	ugly butterfly intersection with many links	aaa
53*	crab intersection	roads on different levels, biiiig roundabout and small roundabout
53*	qtip intersection	aaaaa	37,1696635°E 36,2509261°N
54*	A roundabout	A rounbabout. There are buildings that can't be assessed if we only collapsed the roundabout to an intersection	9,7029579°E 4,0428542°N
55*	Carriageways on multiple levels	Multiple carriageways that are intersecting on two levels.	5,4997942°E 50,8585695°N
56*	Diverging driveways	Dvierging driveways	5,2676932°E 50,6981057°N
57*	Multiple level carriageway	Multiple level carriageway	5,1863271°E 50,7002191°N
58*	2 eggplants	links connecting parallel roads	73°9'41"W 7°3'52"N
59*	1 eggplants	link connecting parallel roads	73°8'10"W 7°5'16"N
60*	note intersection on different levels	but you can get from one place to all directions	73°11'11"W 7°6'12"N
61	multilevel intersection		73°10'17"W 7°4'29"N
62	half butterfly	multilevel, you can get from one place to another - no change proposed, just collapse dual roads	73°8'W 7°5'20"N
63*	outliers	delete	73°7'39"W 7°7'31"N
64*	roundabout and highway	multilevel - no changed proposed, only collapse dual roads	73°7'42"W 7°7'22"N
65*	crazy intersection	aaaa	73°7'6"W 7°7'1"N
66*	A round driveway	A round driveway	5,5068120°E 50,6746300°N
67	multilevel roundabout	no changed proposed except collapsing dual roads	73°5'59"W 7°5'38"N
68	spider*****	multilevel intersection - no change proposed	73°6'35"W 7°6'19"N
69*	multilevel intersection	yet another case	73°6'28"W 7°6'11"N
70	yet another case	no change proposed	73°4'13"W 7°2'9"N
71*	An ovalabout	There is a building inside	5,6155107°E 50,6764454°N	No change suggested
72*	sunny ovalabout	tunnels underneath	73°7'9"W 7°7'39"N
73	A driveway forming a cul-de-sac	A driveway forming a cul-de-sac	5,6217462°E 50,7029093°N	i forgot
74*	eggplant with driveway in the middle		73°4'6"W 7°1'44"N
75*	An oval-ish driveway	The driveway connects surrounding houses	5,5410771°E 50,5862766°N	No change suggested
76	intersection 101	double highway with bridges	174°39'7"E 36°51'27"S
77	intersection 102	double highway with bridges		no change
78	intersection 103	double highway with bridges		no change
79	intersection 104	double highway with bridges
80	double intersection
81	intersection 105	double highway with bridges and link to other roads
82	intersection 106	double highway with bridges and ovalabout
83	intersection 107	double highway with bridges and other links
84	intersection 108	double highway on different levels		no change
85	intersection 109	double highway on different levels
86	intersection 110	double highway on different levels		no change
87	intersection 111	8 highways on different levels aaaaaaaaa
88	intersection 112	i dont know what this is		no change
89	intersection 113	double highway on different levels

ID	Situation	Description	Examples (coords)	Goal
1*	Parallel roads	Collapse the parallel roads, but be careful not to create a connection that does not exist. (There is a wide barrier between the roads, which cannot be crossed.)	9,8198052°E 4,0024864°N
2*	Roundabouts	Delete the roundabout and create an intersection. The roads will intersect in the center of the original roundabout.	9,8213187°E 4,0098569°N
3*	Diverging roads	Roads meeting at an intersection, can be interconnected with side roads. Identify the main roads and delete the side roads.	37,0683693°E 36,3143588°N
4*	T-junction	Road diverging before an intersection. Delete the diverging roads and snap the point of divergence on the intersecting road.	-36.8897222, 174.7512042
5*	Simple intersection	Parallel roads forming an intersection. Collapse the parallel roads.	37,0659947°E 36,3105479°N
6*	A cross-shaped intersection	Two perpendicular roads diverging before an intersection. Delete the diverging roads and snap the points of divergence to the center of the intersection.	9,7410638°E 4,0968701°N
7*	Intersection	Multiple roads meeting at the same location but not meeting at an intersecting point. Find a reasonable intersecting point (e.g. find the centroid of the intersection or find a suitable vertex somewhere along the main road) and connect the roads.	37,1427047°E 36,2365752°N
8*	Side roads	Side roads diverging and converging to the same road. Delete if not considered relevant (e.g. not passing through a gas station).	37,1398569°E 36,2401153°N
9*	Cul-de-sac	Dead-end roads with a circular end. Snap the road to the most distant vertex of the circular part, then delete the circle.	50,605893°N 5,631484°E
10*	Ovalabout	Delete the ovalabout and create an intersection. The roads will intersect in the center of the original ovalabout.	37,1680681°E 36,1939477°N
11*	Cloverleaf interchange	Can be simplified to a basic cross-intersection if one can get from all directions to all directions.	37°13'20"E 36°11'39"N
12*	Multi-level carriageway	The intersecting roads are on different levels and therefore cannot be collapsed to a cross-intersection.	174°50'24"E 36°55'7"S
13	Special case roundabouts	If there is a building or a large object inside a roundabout/ovalabout/intersection, the object cannot be collapsed.	5,6155107°E 50,6764454°N	No change suggested
14*	Parallel roads connected with a linking road	Delete the linking roads and collapse the parallel roads.	73°9'41"W 7°3'52"N
15*	Outliers	Delete any incorrect inputs.	73°7'39"W 7°7'31"N
16*	Parallel road leading to different levels	If there are multiple parallel roads, collapse the ones on the same level, but keep the ones that are on a different level.	9,6611711°E 4,0880919°N
17*	Roundabout with roads on different levels	One cannot get from one direction to all other directions, therefore it cannot be collapsed to an intersection.	37,1797839°E 36,2086177°N
18*	Partial cloverleaf interchange	Can be simplified to a T-intersection if one can get from all directions to all directions.	36,9912088°E 36,0967749°N
19*	Complicated freeway intersection	There is no unified solution.	30,526502°N 114,306260°E

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