From 32e86be1d1448ea8f79d5c4ed5ff85a42459c24c Mon Sep 17 00:00:00 2001
From: Paul Bienkowski <pb@opatut.de>
Date: Sat, 13 Nov 2021 02:17:29 +0100
Subject: [PATCH] Import oneway roads from implicit tags

---
 api/roads_import.lua | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/api/roads_import.lua b/api/roads_import.lua
index c089d58..6d37f07 100644
--- a/api/roads_import.lua
+++ b/api/roads_import.lua
@@ -92,9 +92,10 @@ function osm2pgsql.process_way(object)
     end
 
     local directionality = 0
-    if contains(ONEWAY_YES, tags["oneway"]) then
+    -- See https://wiki.openstreetmap.org/wiki/Key:oneway section "Implied oneway restriction"
+    if contains(ONEWAY_YES, tags.oneway) or tags.junction == "roundabout" or zone == "motorway" then
       directionality = 1
-    elseif contains(ONEWAY_REVERSE, tags["oneway"]) then
+    elseif contains(ONEWAY_REVERSE, tags.oneway) then
       directionality = -1
     end