# Simplification protocol

| ID | Situation | Description | Examples (coords) | Before | 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) | Before | 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|||