diff --git a/src/saem.c b/src/saem.c
index 9dcbcd9..a7e9a6a 100644
--- a/src/saem.c
+++ b/src/saem.c
@@ -377,7 +377,10 @@ void *sa_service(void *fc) {
             // Tolling
             if (facilities->tolling.enabled && 
                 bulletin->to_consume[a]->its_aid == 1 && 
-                now > bulletin->to_consume[a]->t_trigger + TOLLING_PAYMENT_MIN_PERIOD_MS &&
+                (
+                    now > bulletin->to_consume[a]->t_trigger + TOLLING_PAYMENT_MIN_PERIOD_MS || 
+                    (facilities->tolling.protocol.p == TOLLING_PROTOCOL_SIMPLE && tpm_should_retransmit(facilities))
+                ) &&
                 facilities->station_type != 15) {
 
                 tolling_info_t* info = (tolling_info_t*) bulletin->to_consume[a]->info.internal_p;
diff --git a/src/tpm.c b/src/tpm.c
index a860e7f..2664c01 100644
--- a/src/tpm.c
+++ b/src/tpm.c
@@ -38,6 +38,26 @@ int tpm_is_inside_zone(void* fc, tolling_info_t* ti) {
     return 0;
 }
 
+int tpm_should_retransmit(void* fc) {
+    
+    facilities_t* facilities = (facilities_t*) fc;
+    tolling_t* tolling = &facilities->tolling;
+
+    uint64_t now = itss_time_get(&facilities->epv);
+
+    if (tolling->station.obu.rt_on) {
+        if (now > tolling->station.obu.rt_init + TOLLING_RT_TIMEOUT_MS) {
+            tolling->station.obu.rt_on = false;
+            return 0;
+        }
+        if (now > tolling->station.obu.rt_t_trigger + TOLLING_RT_PERIOD_MS) {
+            return 1;
+        }
+    }
+    
+    return 0;
+}
+
 int tpm_pay(void* fc, tolling_info_t* info, void* security_socket, uint8_t* neighbour, uint8_t* dst_addr) {
     int rv = 0;
 
@@ -54,9 +74,16 @@ int tpm_pay(void* fc, tolling_info_t* info, void* security_socket, uint8_t* neig
     }
 
     pthread_mutex_lock(&facilities->epv.time.lock);
-    tolling->tz = itss_ts_get(TIME_MICROSECONDS) ;
+    tolling->tz = itss_ts_get(TIME_MICROSECONDS);
     pthread_mutex_unlock(&facilities->epv.time.lock);
 
+    // Retransmission
+    if (!tolling->station.obu.rt_on) {
+        tolling->station.obu.rt_init = itss_time_get(&facilities->epv);
+        tolling->station.obu.rt_on = true;
+    }
+    tolling->station.obu.rt_t_trigger = itss_time_get(&facilities->epv);
+
     TPM_t* tpm = NULL;
     TransportRequest_t* tr = NULL;
     SecurityRequest_t* sreq = NULL;
@@ -1187,6 +1214,7 @@ int tpm_recv(void* fc, TPM_t* tpm_rx, void* security_socket, uint8_t* neighbour,
                     pthread_mutex_lock(&facilities->epv.time.lock);
                     syslog_info("[facilities] [tolling] entry.reply took %ld us", itss_ts_get(TIME_MICROSECONDS) - tolling->tz);
                     pthread_mutex_unlock(&facilities->epv.time.lock);
+                    tolling->station.obu.rt_on = false;
                     veh_handle_recv(tolling, tpm_rx, security_socket, facilities->tx_queue, &facilities->epv, neighbour, src_addr);
                     break;
                 default:
@@ -1214,6 +1242,7 @@ int tpm_recv(void* fc, TPM_t* tpm_rx, void* security_socket, uint8_t* neighbour,
                     pthread_mutex_lock(&facilities->epv.time.lock);
                     syslog_info("[facilities] [tolling] exit.reply took %ld us", itss_ts_get(TIME_MICROSECONDS) - tolling->tz);
                     pthread_mutex_unlock(&facilities->epv.time.lock);
+                    tolling->station.obu.rt_on = false;
                     veh_handle_recv(tolling, tpm_rx, security_socket, facilities->tx_queue, &facilities->epv, neighbour, src_addr);
                     break;
                 default:
@@ -1238,6 +1267,7 @@ int tpm_recv(void* fc, TPM_t* tpm_rx, void* security_socket, uint8_t* neighbour,
                     pthread_mutex_lock(&facilities->epv.time.lock);
                     syslog_info("[facilities] [tolling] single.reply took %ld us", itss_ts_get(TIME_MICROSECONDS) - tolling->tz);
                     pthread_mutex_unlock(&facilities->epv.time.lock);
+                    tolling->station.obu.rt_on = false;
                     veh_handle_recv(tolling, tpm_rx, security_socket, facilities->tx_queue, &facilities->epv, neighbour, src_addr);
                     break;
                 default:
diff --git a/src/tpm.h b/src/tpm.h
index 6ff4bab..4554335 100644
--- a/src/tpm.h
+++ b/src/tpm.h
@@ -10,6 +10,8 @@
 #define TOLLING_PAYMENT_MIN_PERIOD_MS 40000
 #define TOLLING_MAX_CONNS 64
 #define TOLLING_CONN_TIMEOUT_MS 10000
+#define TOLLING_RT_PERIOD_MS 400
+#define TOLLING_RT_TIMEOUT_MS 5000
 
 typedef enum TOLLING_PROTOCOL {
     TOLLING_PROTOCOL_SIMPLE,
@@ -71,6 +73,11 @@ typedef struct tolling {
             uint64_t client_id;
             uint64_t tls_conn_id;
             TPM_t* entry_proof;
+
+            // Retransmission
+            uint64_t rt_init;
+            uint64_t rt_t_trigger;
+            bool rt_on;
         } obu;
     } station;
 
@@ -95,6 +102,7 @@ int tolling_init(tolling_t* tolling, void* zmq_ctx, char* security_address, uint
 
 int tpm_pay(void* fc, tolling_info_t* info, void* security_socket, uint8_t* neighbour, uint8_t* dst_addr);
 int tpm_recv(void* fc, TPM_t* tpm_rx, void* security_socket, uint8_t* neighbour, uint8_t* src_addr);
+int tpm_should_retransmit(void* fc);
 int tpm_is_inside_zone(void* fc, tolling_info_t* ti);
 
 tolling_info_t* tolling_info_new(itss_epv_t* epv, TollingPaymentInfo_t* tpi);