chore(prototype): street types with overlaid passing lanes (variants A/B)

Copy of country_new_small with a 0.5 m passing lane per direction at the
centre line, offset +-2.5 into the oncoming lane. A and B use opposite
signs because the unit/sign of LaneConfig.offset is unknown.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

mod/content/streets/overtake_proto_a.street_template.lua

@@ -0,0 +1,41 @@
+-- PROTOTYPE (ticket "Can a street type with overlaid passing lanes fake overtaking on single-lane roads?"):
+-- throwaway, lives only on branch prototype/vehicle-probe.
+-- Looks like country_new_small (same style, one visible lane per direction), but each direction gets a narrow
+-- extra passing lane at the centre line, pushed by `offset` over the oncoming lane. Variant A: passing-lane
+-- offsets B +2.5 / F -2.5 (the unit and sign of LaneConfig.offset are unknown; variants A and B use opposite signs).
+function data()
+return {
+		availability = { yearFrom = 0, yearTo = 0 },
+		cost = 180,
+		country = true,
+		defaultWithCrosswalk = false,
+		description = {
+			description = "PROTOTYPE overtaking road, variant A: country small road with overlaid passing lanes (offset B +2.5 / F -2.5).",
+			icon = "::/infrastructure/street/country/country_new_small.tga",
+			name = "Overtake proto A (passing lanes B +2.5 / F -2.5)",
+			previewIcon = "::/infrastructure/street/country/country_new_small_preview.tga",
+		},
+		emissions = { noise = 0, pollution = 0, pollutionRadius = 0, radius = 0 },
+		fillGroundTex = "::/infrastructure/street/shared/street_fill.gtex",
+		laneConfigs = {
+			{ forward = false, height = 0, offset = -1,   speed = 22.22, transportModes = { "PERSON", "CARGO" }, width = 2 },
+			{ forward = false, height = 0, offset = -0.5, speed = 22.22, transportModes = { "CAR", "BUS", "TRUCK" }, width = 5 },
+			-- backward passing lane, meant to sit over the forward driving lane
+			{ forward = false, height = 0, offset = 2.5, speed = 22.22, transportModes = { "CAR", "BUS", "TRUCK" }, width = 0.5 },
+			-- forward passing lane, meant to sit over the backward (oncoming) driving lane
+			{ forward = true,  height = 0, offset = -2.5, speed = 22.22, transportModes = { "CAR", "BUS", "TRUCK" }, width = 0.5 },
+			{ forward = true,  height = 0, offset = 0.5,  speed = 22.22, transportModes = { "CAR", "BUS", "TRUCK" }, width = 5 },
+			{ forward = true,  height = 0, offset = 1,    speed = 22.22, transportModes = { "PERSON", "CARGO" }, width = 2 },
+		},
+		maintenanceCost = 30,
+		menuCategory = { categories = { { category = "roads_country", filterCategories = { }, order = 441 } } },
+		modifiers = { maxSpeedModifier = 0, noiseModifier = 0, pollutionModifier = 0 },
+		pedestrianWalkPenalty = true,
+		priority = 200,
+		roadType = "STREET",
+		sidewalkFillGroundTex = "::/infrastructure/shared/none.gtex",
+		simBuildable = false, -- towns must not build the prototype
+		streetStyle = "::/infrastructure/street/country/country_new_small.street",
+		builderAudioRes = "::/gui/construction/sound/buildoze_street.builder_audio",
+	}
+end

mod/content/streets/overtake_proto_b.street_template.lua

@@ -0,0 +1,41 @@
+-- PROTOTYPE (ticket "Can a street type with overlaid passing lanes fake overtaking on single-lane roads?"):
+-- throwaway, lives only on branch prototype/vehicle-probe.
+-- Looks like country_new_small (same style, one visible lane per direction), but each direction gets a narrow
+-- extra passing lane at the centre line, pushed by `offset` over the oncoming lane. Variant B: passing-lane
+-- offsets B -2.5 / F +2.5 (the unit and sign of LaneConfig.offset are unknown; variants A and B use opposite signs).
+function data()
+return {
+		availability = { yearFrom = 0, yearTo = 0 },
+		cost = 180,
+		country = true,
+		defaultWithCrosswalk = false,
+		description = {
+			description = "PROTOTYPE overtaking road, variant B: country small road with overlaid passing lanes (offset B -2.5 / F +2.5).",
+			icon = "::/infrastructure/street/country/country_new_small.tga",
+			name = "Overtake proto B (passing lanes B -2.5 / F +2.5)",
+			previewIcon = "::/infrastructure/street/country/country_new_small_preview.tga",
+		},
+		emissions = { noise = 0, pollution = 0, pollutionRadius = 0, radius = 0 },
+		fillGroundTex = "::/infrastructure/street/shared/street_fill.gtex",
+		laneConfigs = {
+			{ forward = false, height = 0, offset = -1,   speed = 22.22, transportModes = { "PERSON", "CARGO" }, width = 2 },
+			{ forward = false, height = 0, offset = -0.5, speed = 22.22, transportModes = { "CAR", "BUS", "TRUCK" }, width = 5 },
+			-- backward passing lane, meant to sit over the forward driving lane
+			{ forward = false, height = 0, offset = -2.5, speed = 22.22, transportModes = { "CAR", "BUS", "TRUCK" }, width = 0.5 },
+			-- forward passing lane, meant to sit over the backward (oncoming) driving lane
+			{ forward = true,  height = 0, offset = 2.5, speed = 22.22, transportModes = { "CAR", "BUS", "TRUCK" }, width = 0.5 },
+			{ forward = true,  height = 0, offset = 0.5,  speed = 22.22, transportModes = { "CAR", "BUS", "TRUCK" }, width = 5 },
+			{ forward = true,  height = 0, offset = 1,    speed = 22.22, transportModes = { "PERSON", "CARGO" }, width = 2 },
+		},
+		maintenanceCost = 30,
+		menuCategory = { categories = { { category = "roads_country", filterCategories = { }, order = 442 } } },
+		modifiers = { maxSpeedModifier = 0, noiseModifier = 0, pollutionModifier = 0 },
+		pedestrianWalkPenalty = true,
+		priority = 200,
+		roadType = "STREET",
+		sidewalkFillGroundTex = "::/infrastructure/shared/none.gtex",
+		simBuildable = false, -- towns must not build the prototype
+		streetStyle = "::/infrastructure/street/country/country_new_small.street",
+		builderAudioRes = "::/gui/construction/sound/buildoze_street.builder_audio",
+	}
+end