diff --git a/scripts/create_osm_roads.sql b/scripts/create_osm_roads.sql
index a539ef7..ade2b0e 100644
--- a/scripts/create_osm_roads.sql
+++ b/scripts/create_osm_roads.sql
@@ -29,10 +29,11 @@
 
 -- 2. création de la table qui va accueillir les tronçons de routes
 
--- table osm_roads
+-- la table qui contient le graphe routier de OSM
 DROP TABLE IF EXISTS osm_roads ;
 CREATE TABLE osm_roads
 (
+  uid bigint,
   osm_id bigint,
   highway text,
   type text,
@@ -41,7 +42,7 @@ CREATE TABLE osm_roads
   name_fr text,
   name_br text,
   the_geom geometry,
-  CONSTRAINT osm_roads_pkey PRIMARY KEY (osm_id),
+  CONSTRAINT osm_roads_pkey PRIMARY KEY (uid),
   CONSTRAINT enforce_geotype_the_geom CHECK (geometrytype(the_geom) = 'LINESTRING'::text OR geometrytype(the_geom) = 'MULTILINESTRING'::text),
   CONSTRAINT enforce_srid_the_geom CHECK (st_srid(the_geom) = 2154)
 );
@@ -64,6 +65,7 @@ WITH trace_buffer AS (
 INSERT INTO osm_roads
 (
   SELECT
+    row_number() over() as id,
     osm_id,
     highway,
     CASE 
diff --git a/scripts/create_tables.sql b/scripts/create_tables.sql
index 072c0e6..aa157d1 100644
--- a/scripts/create_tables.sql
+++ b/scripts/create_tables.sql
@@ -171,6 +171,7 @@ CREATE VIEW phase_1_tdb AS
 DROP TABLE IF EXISTS osm_roads ;
 CREATE TABLE osm_roads
 (
+  id bigint,
   osm_id bigint,
   highway text,
   type text,
@@ -179,7 +180,7 @@ CREATE TABLE osm_roads
   name_fr text,
   name_br text,
   the_geom geometry,
-  CONSTRAINT osm_roads_pkey PRIMARY KEY (osm_id),
+  CONSTRAINT osm_roads_pkey PRIMARY KEY (id),
   CONSTRAINT enforce_geotype_the_geom CHECK (geometrytype(the_geom) = 'LINESTRING'::text OR geometrytype(the_geom) = 'MULTILINESTRING'::text),
   CONSTRAINT enforce_srid_the_geom CHECK (st_srid(the_geom) = 2154)
 );
diff --git a/scripts/traitements_phase_2.sql b/scripts/traitements_phase_2.sql
index 1b1c70e..b62057b 100644
--- a/scripts/traitements_phase_2.sql
+++ b/scripts/traitements_phase_2.sql
@@ -18,6 +18,6 @@ ALTER TABLE osm_roads ADD COLUMN source integer ;
 ALTER TABLE osm_roads ADD COLUMN target integer ;
 
 -- calcul de la topologie
-SELECT pgr_createTopology('osm_roads', 0.000001, 'the_geom', 'osm_id');
+SELECT pgr_createTopology('osm_roads', 0.000001);