diff --git a/lib/merge/customization.js b/lib/merge/customization.js
new file mode 100644
index 0000000..504740f
--- /dev/null
+++ b/lib/merge/customization.js
@@ -0,0 +1,49 @@
+const {chain} = require('lodash')
+
+const NOM_VOIE_PRIORITY = {
+  bal: 5,
+  ban: 4,
+  cadastre: 3,
+  bano: 2,
+  ftth: 1
+}
+
+function selectByPriority(values, priorityMap) {
+  if (Object.keys(values).length === 0) {
+    return
+  }
+  return chain(values)
+    .toPairs()
+    .map(([source, value]) => ({source, value}))
+    .maxBy(({source}) => priorityMap[source])
+    .value()
+    .value
+}
+
+function computeNomVoie(nomsVoie) {
+  return selectByPriority(nomsVoie, NOM_VOIE_PRIORITY)
+}
+
+function computePositionProps(positions) {
+  if (positions.bal) {
+    return {...positions.bal, positionSource: 'bal'}
+  }
+  if (positions.ban) {
+    return {...positions.ban, positionSource: 'ban'}
+  }
+  if (positions.cadastre && positions.cadastre.positionType === 'entrée') {
+    return {...positions.cadastre, positionSource: 'cadastre'}
+  }
+  if (positions.bano) {
+    return {...positions.bano, positionSource: 'bano'}
+  }
+  if (positions.ftth) {
+    return {...positions.ftth, positionSource: 'ftth'}
+  }
+  if (positions.cadastre) {
+    return {...positions.cadastre, positionSource: 'cadastre'} // Centre de parcelle
+  }
+  return {}
+}
+
+module.exports = {computePositionProps, computeNomVoie}
diff --git a/lib/merge/index.js b/lib/merge/index.js
index 5bdc3cd..95b5bf9 100644
--- a/lib/merge/index.js
+++ b/lib/merge/index.js
@@ -5,48 +5,7 @@ const {createPseudoCodeVoieGenerator} = require('../voies')
 const {rewriteSuffixes} = require('../numeros')
 const {getNomCommune} = require('./cog')
 const computeGroups = require('./processing/compute-groups')
-
-const NOM_VOIE_PRIORITY = {
-  bal: 5,
-  ban: 4,
-  cadastre: 3,
-  bano: 2,
-  ftth: 1
-}
-
-function selectByPriority(values, priorityMap) {
-  if (Object.keys(values).length === 0) {
-    return
-  }
-  return chain(values)
-    .toPairs()
-    .map(([source, value]) => ({source, value}))
-    .maxBy(({source}) => priorityMap[source])
-    .value()
-    .value
-}
-
-function computePositionProps(positions) {
-  if (positions.bal) {
-    return {...positions.bal, positionSource: 'bal'}
-  }
-  if (positions.ban) {
-    return {...positions.ban, positionSource: 'ban'}
-  }
-  if (positions.cadastre && positions.cadastre.positionType === 'entrée') {
-    return {...positions.cadastre, positionSource: 'cadastre'}
-  }
-  if (positions.bano) {
-    return {...positions.bano, positionSource: 'bano'}
-  }
-  if (positions.ftth) {
-    return {...positions.ftth, positionSource: 'ftth'}
-  }
-  if (positions.cadastre) {
-    return {...positions.cadastre, positionSource: 'cadastre'} // Centre de parcelle
-  }
-  return {}
-}
+const {computePositionProps, computeNomVoie} = require('./customization')
 
 const SOURCES_LOADERS = {
   ban: require('./sources/ban'),
@@ -101,7 +60,7 @@ async function merge(options) {
           }))
           .value()
 
-        const nomVoie = selectByPriority(nomsVoie, NOM_VOIE_PRIORITY)
+        const nomVoie = computeNomVoie(nomsVoie)
 
         /* Codes voie */