diff --git a/src/dcm.h b/src/dcm.h
index ba613bc..8a81a77 100644
--- a/src/dcm.h
+++ b/src/dcm.h
@@ -5,6 +5,13 @@
 
 typedef struct coordination {
     bool active;
+    
+
+    struct {
+        bool intersecting;
+        uint64_t t_negotiation;
+
+    } neighbours;
 
 } coordination_s;
 
diff --git a/src/saem.c b/src/saem.c
index 394a6f2..f6869bb 100644
--- a/src/saem.c
+++ b/src/saem.c
@@ -340,6 +340,8 @@ void *sa_service(void *fc) {
         lon = facilities->epv.space.longitude;
         it2s_tender_unlock_space(&facilities->epv);
 
+        uint64_t now = it2s_tender_get_clock(&facilities->epv);
+
         pthread_mutex_lock(&bulletin->lock);
         for (int a = 0; a < bulletin->to_consume_len; ++a) {
             /* do some checks, e.g.
@@ -349,7 +351,7 @@ void *sa_service(void *fc) {
             // Tolling
             if (facilities->tolling.enabled && 
                 bulletin->to_consume[a]->its_aid == 0 && 
-                !bulletin->to_consume[a]->n_trigger &&
+                now > bulletin->to_consume[a]->t_trigger + TOLLING_PAYMENT_MIN_PERIOD_MS &&
                 facilities->station_type != 15) {
 
                 if (!tpm_is_inside_zone(facilities, (tolling_info_s*) bulletin->to_consume[a]->info.internal_p)) {
@@ -360,6 +362,7 @@ void *sa_service(void *fc) {
                     case TOLLING_PROTOCOL_SIMPLE:
                         tpm_pay(facilities, bulletin->to_consume[a]->certificate_id);
                         ++bulletin->to_consume[a]->n_trigger;
+                        bulletin->to_consume[a]->t_trigger = now;
                         break;
 
                     case TOLLING_PROTOCOL_TLS:;
diff --git a/src/saem.h b/src/saem.h
index 0de7013..28fe300 100644
--- a/src/saem.h
+++ b/src/saem.h
@@ -28,7 +28,8 @@ typedef struct announcement {
     uint64_t station_id;
     uint64_t timestamp;
 
-    uint32_t n_trigger;
+    uint32_t n_trigger; /* number of times service was triggered */
+    uint64_t t_trigger; /* last trigger timestamp */
 } announcement_t;
 
 typedef struct bulletin {
diff --git a/src/tpm.h b/src/tpm.h
index 43acc6b..61b4021 100644
--- a/src/tpm.h
+++ b/src/tpm.h
@@ -6,6 +6,7 @@
 #include <stdbool.h>
 
 #define TOLLING_INFOS_MAX_LENGTH 16
+#define TOLLING_PAYMENT_MIN_PERIOD_MS 60000
 
 typedef enum TOLLING_PROTOCOL {
     TOLLING_PROTOCOL_SIMPLE,