diff --git a/ps3/ps02q/traffic_light_controler.v b/ps3/ps02q/traffic_light_controler.v
index 90bf36d..54a3088 100644
--- a/ps3/ps02q/traffic_light_controler.v
+++ b/ps3/ps02q/traffic_light_controler.v
@@ -47,7 +47,7 @@
 ///////////////////////////////////////////////////////////////////
 
 module smart_tl_ctl #( parameter
-	PARAMETER = 45,
+    PARAMETER	 = 45,
     MR_GREEN_TIME = 30, 
     SR_GREEN_TIME = 10,
     YELLOW_TIME = 3
@@ -105,10 +105,14 @@ always@(posedge clk) begin
                 r_cnt = 0;
                 r_next = MR_GREEN_1;
                 end
-            else if (r_cnt >= MR_GREEN_TIME) & (MR_cars != 0) begin
+            else if (r_cnt >= MR_GREEN_TIME) & (MR_cars < PARAMETER) begin
                 r_cnt = 0;
                 r_next = MR_GREEN_2;
                 end
+            else if (r_cnt >= MR_GREEN_TIME) & (MR_cars >= PARAMETER) begin
+                r_cnt = 0;
+                r_next = MR_YELLOW;
+                end
         end
         MR_GREEN_2:  begin
             r_MR_ctl = 'b11;