diff --git a/.gitmodules b/.gitmodules
index ff46d50..193031d 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -11,3 +11,6 @@
 [submodule "testcases/elm-markdown/repo"]
 	path = testcases/elm-markdown/repo
 	url = https://github.com/dillonkearns/elm-markdown
+[submodule "testcases/liikennematto/repo"]
+	path = testcases/liikennematto/repo
+	url = git@github.com:klemola/liikennematto.git
diff --git a/testcases/liikennematto/Suite.elm b/testcases/liikennematto/Suite.elm
new file mode 100644
index 0000000..25dfb81
--- /dev/null
+++ b/testcases/liikennematto/Suite.elm
@@ -0,0 +1,17 @@
+module Suite exposing (suite)
+
+{-| -}
+
+import RoadNetwork
+import V8.Benchmark.Runner.Json exposing (..)
+import Worlds
+
+
+suite : Benchmark
+suite =
+    describe "Road network graph performance"
+        [ benchmark "small map" <|
+            \_ -> RoadNetwork.fromBoardAndLots Worlds.worldWithFourWayIntersection.board Worlds.worldWithFourWayIntersection.lots
+        , benchmark "map with parallel roads" <|
+            \_ -> RoadNetwork.fromBoardAndLots Worlds.worldThatHasParallelRoads.board Worlds.worldThatHasParallelRoads.lots
+        ]
diff --git a/testcases/liikennematto/V8/Benchmark.elm b/testcases/liikennematto/V8/Benchmark.elm
new file mode 100644
index 0000000..ad03aad
--- /dev/null
+++ b/testcases/liikennematto/V8/Benchmark.elm
@@ -0,0 +1,18 @@
+port module V8.Benchmark exposing (main)
+
+{-| -}
+
+
+import V8.Benchmark.Runner.Json
+import Suite
+import Json.Encode
+
+
+main : V8.Benchmark.Runner.Json.JsonBenchmark
+main =
+    V8.Benchmark.Runner.Json.program
+        reportResults
+        Suite.suite
+
+
+port reportResults : Json.Encode.Value -> Cmd msg
diff --git a/testcases/liikennematto/V8/Benchmark/Runner/Json.elm b/testcases/liikennematto/V8/Benchmark/Runner/Json.elm
new file mode 100644
index 0000000..7fffa33
--- /dev/null
+++ b/testcases/liikennematto/V8/Benchmark/Runner/Json.elm
@@ -0,0 +1,291 @@
+module V8.Benchmark.Runner.Json exposing ( Benchmark, JsonBenchmark, program, describe, benchmark)
+
+{-|
+@docs Benchmark,  describe, benchmark
+
+@docs JsonBenchmark, program
+
+-}
+
+import V8.Benchmark.Samples as Samples exposing (Samples)
+import V8.Benchmark.Status as Status
+import Browser
+import Html exposing (Html)
+import Html.Attributes as Attr
+import Json.Encode as Encode
+import Process
+import Task exposing (Task)
+import Trend.Linear as Trend exposing (Quick, Trend)
+import V8.Debug
+import Benchmark.LowLevel as LowLevel
+
+
+type Benchmark
+    = Single String LowLevel.Operation Status.Status
+    | Group String (List Benchmark)
+
+
+describe : String -> List Benchmark -> Benchmark
+describe =
+    Group
+
+benchmark : String -> (() -> a) -> Benchmark
+benchmark name fn =
+    Single name (LowLevel.operation fn) Status.Cold
+
+
+
+done : Benchmark -> Bool
+done bench =
+    case bench of
+        Single _ _ status ->
+            Status.progress status == 1
+
+        Group _ benchmarks ->
+            List.all done benchmarks
+
+type alias JsonBenchmark =
+    Program () Model Msg
+
+
+{-| A benchmark runner which will send results out a port when done.
+-}
+program : (Encode.Value -> Cmd Msg) -> Benchmark -> Program () Model Msg
+program sendReport bench =
+    Platform.worker
+        { init = init bench
+        , update = update sendReport
+        , subscriptions = \_ -> Sub.none
+        }
+
+
+type alias Model =
+    Benchmark
+
+
+init : Benchmark -> () -> ( Model, Cmd Msg )
+init bench _ =
+    ( bench, next bench )
+
+
+type Msg
+    = Update Benchmark
+    | Finished Benchmark
+
+update : (Encode.Value -> Cmd Msg) -> Msg -> Model -> ( Model, Cmd Msg )
+update sendReport msg model =
+    case msg of
+        Finished bench ->
+            ( bench
+            , sendReport
+                (Encode.object
+                    [ ("benchmarks", (encode bench))
+                    , ("v8", V8.Debug.reportV8StatusForBenchmarks ())
+                    ]
+                )
+            )
+        Update bench ->
+            if done bench then
+                let
+                    _ = V8.Debug.enableMemoryChecks ()
+
+                in
+                ( bench
+                , singleSampleForSideEffects bench
+                    |> Task.perform Finished
+                )
+
+            else
+                ( bench
+                , next bench
+                )
+
+
+breakForRender : Task x a -> Task x a
+breakForRender task =
+    Task.andThen (\_ -> task) (Process.sleep 0)
+
+
+next : Benchmark -> Cmd Msg
+next bench =
+    if done bench then
+        Cmd.none
+
+    else
+        step bench
+            |> breakForRender
+            |> Task.perform (Update)
+
+{-| This is
+
+
+-}
+singleSampleForSideEffects : Benchmark -> Task Never Benchmark
+singleSampleForSideEffects bench =
+        case bench of
+            Single name operation status ->
+                LowLevel.sample 1 operation
+                    |> Task.map (\_ -> bench)
+                    |> Task.onError (\_ -> Task.succeed bench)
+
+            Group name benchmarks ->
+                benchmarks
+                    |> List.map singleSampleForSideEffects
+                    |> Task.sequence
+                    |> Task.map (Group name)
+
+step : Benchmark -> Task Never Benchmark
+step benchmark_ =
+    case benchmark_ of
+        Single name inner status ->
+            stepLowLevel inner status
+                |> Task.map (Single name inner)
+
+        Group name benchmarks ->
+            benchmarks
+                |> List.map step
+                |> Task.sequence
+                |> Task.map (Group name)
+
+
+stepLowLevel : LowLevel.Operation -> Status.Status -> Task Never Status.Status
+stepLowLevel operation status =
+    case status of
+        Status.Cold ->
+            LowLevel.warmup operation
+                |> Task.map (\_ -> Status.Unsized)
+                |> Task.onError (Task.succeed << Status.Failure << Status.MeasurementError)
+
+        Status.Unsized ->
+            LowLevel.findSampleSize operation
+                |> Task.map
+                    (\sampleSize ->
+                        Status.Pending
+                            sampleSize
+                            Samples.empty
+                    )
+                |> Task.onError (Task.succeed << Status.Failure << Status.MeasurementError)
+
+        Status.Pending baseSampleSize samples ->
+            let
+                sampleSize =
+                    baseSampleSize * (Status.bucketSpacingRatio * modBy Status.numBuckets (Samples.count samples) + 1)
+            in
+            LowLevel.sample sampleSize operation
+                |> Task.map
+                    (\newSample ->
+                        let
+                            newSamples =
+                                Samples.record sampleSize newSample samples
+                        in
+                        if Samples.count newSamples >= (Status.numBuckets * Status.samplesPerBucket) then
+                            finalize newSamples
+
+                        else
+                            Status.Pending baseSampleSize newSamples
+                    )
+                |> Task.onError (Task.succeed << Status.Failure << Status.MeasurementError)
+
+        _ ->
+            Task.succeed status
+
+finalize : Samples -> Status.Status
+finalize samples =
+    case Samples.trend samples of
+        Ok trend ->
+            Status.Success samples trend
+
+        Err err ->
+            Status.Failure (Status.AnalysisError err)
+
+
+-- ENCODE RESULTS
+
+
+encode : Benchmark -> Encode.Value
+encode bench =
+    bench
+        |> flattenReport
+        |> Encode.list encodeResultItem
+
+
+
+
+type alias Item =
+    { name : String
+    , tags : List String
+    , status : Status.Status
+    }
+
+
+flattenReport : Benchmark -> List Item
+flattenReport report =
+    case report of
+        Single name op status ->
+            [ { name = name
+              , tags = []
+              , status = status
+              }
+            ]
+
+        Group name benchmarks ->
+            List.concatMap (flattenReportGroup [ name ]) benchmarks
+
+
+flattenReportGroup : List String -> Benchmark -> List Item
+flattenReportGroup groups report =
+    case report of
+        Single name op status ->
+            [ { name = name
+              , tags = groups
+              , status = status
+              }
+            ]
+
+        Group name benchmarks ->
+            List.concatMap (flattenReportGroup (groups ++ [ name ])) benchmarks
+
+
+encodeResultItem : Item -> Encode.Value
+encodeResultItem item =
+    Encode.object
+        [ ( "name", Encode.string item.name )
+        , ( "tags", Encode.list Encode.string item.tags )
+        , ( "status", encodeStatus item.status )
+        ]
+
+
+encodeStatus : Status.Status -> Encode.Value
+encodeStatus status =
+    case status of
+        Status.Cold ->
+            Encode.object
+                [ ( "status", Encode.string "cold" ) ]
+
+        Status.Unsized ->
+            Encode.object
+                [ ( "status", Encode.string "unsized" ) ]
+
+        Status.Pending i samples ->
+            Encode.object
+                [ ( "status", Encode.string "pending" )
+                , ( "progress", Encode.float (Status.progress status) )
+                ]
+
+        Status.Failure error ->
+            Encode.object
+                [ ( "status", Encode.string "failure" ) ]
+
+        Status.Success samples quickTrend ->
+            Encode.object
+                [ ( "status", Encode.string "success" )
+                , ( "runsPerSecond", Encode.int (runsPerSecond quickTrend) )
+                , ( "goodnessOfFit", Encode.float (Trend.goodnessOfFit quickTrend) )
+                ]
+
+
+runsPerSecond : Trend Quick -> Int
+runsPerSecond =
+    Trend.line
+        >> (\a -> Trend.predictX a 1000)
+        >> floor
diff --git a/testcases/liikennematto/V8/Benchmark/Samples.elm b/testcases/liikennematto/V8/Benchmark/Samples.elm
new file mode 100644
index 0000000..75a8101
--- /dev/null
+++ b/testcases/liikennematto/V8/Benchmark/Samples.elm
@@ -0,0 +1,134 @@
+module V8.Benchmark.Samples exposing
+    ( Samples, empty, record, count
+    , Point, points, trend
+    )
+
+{-| Collect benchmarking runs with their sample size.
+
+
+# Sampling
+
+@docs Samples, empty, record, count
+
+
+## Evaluation
+
+@docs Lines, Line, all, fitLines
+
+-}
+
+import Dict exposing (Dict)
+import Trend.Linear exposing (Quick, Trend, line, predictY, quick, robust)
+import Trend.Math as Math exposing (Error)
+
+
+{-| Samples keeps track of the sample size at which samples have been
+gathered.
+-}
+type Samples
+    = Samples (Dict Int (List Float))
+
+
+{-| an empty samples for initializing things
+-}
+empty : Samples
+empty =
+    Samples Dict.empty
+
+
+{-| How many samples have we collected in total?
+-}
+count : Samples -> Int
+count (Samples samples) =
+    Dict.foldl (\_ times acc -> List.length times + acc) 0 samples
+
+
+{-| Record a new sample
+-}
+record : Int -> Float -> Samples -> Samples
+record sampleSize sample (Samples samplesDict) =
+    Samples <|
+        Dict.update
+            sampleSize
+            (\value ->
+                case value of
+                    Nothing ->
+                        Just [ sample ]
+
+                    Just samples_ ->
+                        Just (sample :: samples_)
+            )
+            samplesDict
+
+
+{-| A point representing `(sampleSize, runtime)`.
+-}
+type alias Point =
+    ( Float, Float )
+
+
+groups : Samples -> ( Dict Int (List Float), Dict Int (List Float) )
+groups (Samples samples) =
+    samples
+        |> pointify
+        |> robust
+        |> Result.map line
+        |> Result.map
+            (\line ->
+                Dict.map
+                    (\sampleSize values ->
+                        let
+                            predicted =
+                                predictY line (toFloat sampleSize)
+
+                            upperBound =
+                                predicted * 1.1
+
+                            lowerBound =
+                                predicted / 1.1
+                        in
+                        List.partition (\v -> lowerBound < v && v < upperBound) values
+                    )
+                    samples
+            )
+        |> Result.map
+            (Dict.foldl
+                (\key ( good, outliers ) ( accGood, accOutliers ) ->
+                    ( Dict.insert key good accGood
+                    , Dict.insert key outliers accOutliers
+                    )
+                )
+                ( Dict.empty, Dict.empty )
+            )
+        |> Result.withDefault ( samples, Dict.empty )
+
+
+{-| The `(sampleSize, runtime)` coordinates for plotting or
+calculation. The first item in the tuple is the points to be used for
+consideration in a trend. The second item contains the outliers.
+-}
+points : Samples -> ( List Point, List Point )
+points samples =
+    groups samples
+        |> Tuple.mapFirst pointify
+        |> Tuple.mapSecond pointify
+
+
+pointify : Dict Int (List Float) -> List Point
+pointify samples =
+    Dict.foldr
+        (\sampleSize values acc ->
+            List.map (\b -> ( toFloat sampleSize, b )) values ++ acc
+        )
+        []
+        samples
+
+
+{-| Get a trend for these samples, ignoring outliers.
+-}
+trend : Samples -> Result Error (Trend Quick)
+trend samples =
+    samples
+        |> points
+        |> Tuple.first
+        |> quick
\ No newline at end of file
diff --git a/testcases/liikennematto/V8/Benchmark/Status.elm b/testcases/liikennematto/V8/Benchmark/Status.elm
new file mode 100644
index 0000000..2069fe2
--- /dev/null
+++ b/testcases/liikennematto/V8/Benchmark/Status.elm
@@ -0,0 +1,114 @@
+module V8.Benchmark.Status exposing
+    ( Status(..), progress
+    , Error(..)
+    , numBuckets, samplesPerBucket, bucketSpacingRatio
+    )
+
+{-| Report the status of a Benchmark.
+
+
+# Reporting
+
+@docs Status, progress
+
+@docs Error
+
+
+## Runtime Configuration
+
+@docs numBuckets, samplesPerBucket, bucketSpacingRatio
+
+-}
+
+import Benchmark.LowLevel as LowLevel
+import V8.Benchmark.Samples as Samples exposing (Samples)
+import Trend.Linear exposing (Quick, Trend)
+import Trend.Math as Math
+
+
+{-| Ways a benchmark can fail, expressed as either at runtime (in
+which case we have a `LowLevel.Error`) or while analyzing data (in
+which case we have a `Trend.Math.Error`.)
+-}
+type Error
+    = MeasurementError LowLevel.Error
+    | AnalysisError Math.Error
+
+
+{-| Indicate the status of a benchmark.
+
+  - `Cold`: We have not warmed up the JIT yet.
+
+  - `Unsized`: We have not yet determined the best sample size for
+    this benchmark.
+
+  - `Pending`: We are in the process of collecting sample data. We
+    will keep collecting sample data using the base sample size (first
+    argument) until we have enough samples (`numBuckets *
+    samplesPerBucket`.) We also store samples while in progress
+    (second argument.)
+
+  - `Failure`: We ran into an exception while collecting sample
+    data. The attached `Error` tells us what went wrong.
+
+  - `Success`: We finished collecting all our sample data (first
+    argument.) We've calculated a trend using this data (second
+    argument.)
+
+See "The Life of a Benchmark" in the docs for `Benchmark` for an
+explanation of how these fit together.
+
+-}
+type Status
+    = Cold
+    | Unsized
+    | Pending Int Samples
+    | Failure Error
+    | Success Samples (Trend Quick)
+
+
+{-| How far along is this benchmark? This is a percentage, represented
+as a `Float` between `0` and `1`.
+-}
+progress : Status -> Float
+progress status =
+    case status of
+        Cold ->
+            0
+
+        Unsized ->
+            0
+
+        Pending _ samples ->
+            toFloat (Samples.count samples) / toFloat (numBuckets * samplesPerBucket) |> clamp 0 1
+
+        Failure _ ->
+            1
+
+        Success _ _ ->
+            1
+
+
+
+-- Configuration
+
+
+{-| How many buckets are samples spread out into?
+-}
+numBuckets : Int
+numBuckets =
+    25
+
+
+{-| How many samples will we take per bucket?
+-}
+samplesPerBucket : Int
+samplesPerBucket =
+    5
+
+
+{-| How far apart should the sample size for each bucket be?
+-}
+bucketSpacingRatio : Int
+bucketSpacingRatio =
+    2
\ No newline at end of file
diff --git a/testcases/liikennematto/V8/Debug.elm b/testcases/liikennematto/V8/Debug.elm
new file mode 100644
index 0000000..b84b326
--- /dev/null
+++ b/testcases/liikennematto/V8/Debug.elm
@@ -0,0 +1,69 @@
+module V8.Debug exposing (enableMemoryChecks, memory, optimizationStatus, reportV8StatusForBenchmarks)
+
+{-| -}
+
+import Json.Encode
+
+
+enableMemoryChecks : () -> ()
+enableMemoryChecks _ =
+    ()
+
+
+memory : String -> a -> a
+memory tag v =
+    v
+
+
+type Status
+    = Status Int
+
+
+optimizationStatus : String -> a -> a
+optimizationStatus tag value =
+    value
+
+
+{-|
+
+    hasFastProperties obj
+
+    hasFastSmiElements obj
+
+    hasFastObjectElements obj
+
+    hasFastDoubleElements obj
+
+    hasDictionaryElements obj
+
+    hasFastHoleyElements obj
+
+    haveSameMap ( obj1, obj2 )
+
+    isValidSmi obj
+
+    isSmi obj
+
+    hasFastSmiOrObjectElements obj
+
+    hasSloppyArgumentsElements obj
+
+-}
+type alias MemoryProperties =
+    { tag : String
+    , hasFastProperties : Bool
+    , hasFastSmiElements : Bool
+    , hasFastObjectElements : Bool
+    , hasFastDoubleElements : Bool
+    , hasDictionaryElements : Bool
+    , hasFastHoleyElements : Bool
+    , isValidSmi : Bool
+    , isSmi : Bool
+    , hasFastSmiOrObjectElements : Bool
+    , hasSloppyArgumentsElements : Bool
+    }
+
+
+reportV8StatusForBenchmarks : () -> Json.Encode.Value
+reportV8StatusForBenchmarks _ =
+    Json.Encode.null
diff --git a/testcases/liikennematto/elm.json b/testcases/liikennematto/elm.json
new file mode 100644
index 0000000..828f505
--- /dev/null
+++ b/testcases/liikennematto/elm.json
@@ -0,0 +1,52 @@
+{
+    "type": "application",
+    "source-directories": [
+        ".",
+        "repo/src",
+        "repo/fixtures"
+    ],
+    "elm-version": "0.19.1",
+    "dependencies": {
+        "direct": {
+            "BrianHicks/elm-trend": "2.1.3",
+            "avh4/elm-color": "1.0.0",
+            "elm/browser": "1.0.2",
+            "elm/core": "1.0.5",
+            "elm/html": "1.0.0",
+            "elm/json": "1.1.3",
+            "elm/random": "1.0.0",
+            "elm/svg": "1.0.1",
+            "elm/time": "1.0.0",
+            "elm-community/dict-extra": "2.4.0",
+            "elm-community/graph": "6.0.0",
+            "elm-community/intdict": "3.0.0",
+            "elm-community/maybe-extra": "5.2.0",
+            "elm-community/random-extra": "3.2.0",
+            "elm-explorations/benchmark": "1.0.2",
+            "evelios/elm-geometry-quadtree": "1.0.0",
+            "ianmackenzie/elm-geometry": "3.9.0",
+            "ianmackenzie/elm-units": "2.9.0",
+            "mdgriffith/elm-ui": "1.1.8"
+        },
+        "indirect": {
+            "Gizra/elm-all-set": "1.0.1",
+            "avh4/elm-fifo": "1.0.4",
+            "elm/regex": "1.0.0",
+            "elm/url": "1.0.0",
+            "elm/virtual-dom": "1.0.2",
+            "elm-community/result-extra": "2.4.0",
+            "ianmackenzie/elm-1d-parameter": "1.0.1",
+            "ianmackenzie/elm-float-extra": "1.1.0",
+            "ianmackenzie/elm-interval": "2.0.0",
+            "ianmackenzie/elm-triangular-mesh": "1.1.0",
+            "ianmackenzie/elm-units-interval": "2.3.0",
+            "mdgriffith/style-elements": "5.0.2",
+            "pzp1997/assoc-list": "1.0.0",
+            "robinheghan/murmur3": "1.0.0"
+        }
+    },
+    "test-dependencies": {
+        "direct": {},
+        "indirect": {}
+    }
+}
diff --git a/testcases/liikennematto/output/.keep b/testcases/liikennematto/output/.keep
new file mode 100644
index 0000000..e69de29
diff --git a/testcases/liikennematto/repo b/testcases/liikennematto/repo
new file mode 160000
index 0000000..b3d6bef
--- /dev/null
+++ b/testcases/liikennematto/repo
@@ -0,0 +1 @@
+Subproject commit b3d6befa7d78b4cc563d9c87bd8fc1f4c2b593dc