{"id":146077,"date":"2025-07-23T11:31:31","date_gmt":"2025-07-23T06:01:31","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=146077"},"modified":"2025-07-23T11:31:31","modified_gmt":"2025-07-23T06:01:31","slug":"traffic-light-simulation-in-dsa-cpp","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/traffic-light-simulation-in-dsa-cpp\/","title":{"rendered":"DSA C++ Project &#8211; Traffic Light Simulation"},"content":{"rendered":"<h3>Program 1<\/h3>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">\/\/ Project: Traffic Light Simulation Using Queue Linked List \r\n\/\/----------------------------------------------------------\r\n\/\/ Features:\r\n\/\/ Add vehicles to queue (simulating arrival)\r\n\/\/ Process vehicles when the signal turns green\r\n\/\/ Show vehicles in the queue\r\n\/\/ Count waiting vehicles\r\n\/\/ Clear All Vehicles (Emergency Clear Signal)\r\n\/\/Search for a Vehicle by Number\r\n\/\/Display First and Last Vehicle in Queue\r\n\/\/Log of Passed Vehicles\r\n\r\n#include &lt;iostream&gt;\r\n#include &lt;string&gt;\r\nusing namespace std;\r\n\r\nclass Vehicle               \/\/ Node Class \r\n{\r\npublic:\r\n    string number;\r\n    Vehicle* next;\r\n    \/\/ Vehicle(string num)\r\n    \/\/ {\r\n    \/\/     this-&gt;number=num;\r\n    \/\/     this-&gt;next=nullptr;\r\n    \/\/ }\r\n    Vehicle(string num) : number(num), next(nullptr) {}\r\n};\r\n\r\nclass TrafficQueue \r\n{\r\npublic:\r\n    Vehicle* front;\r\n    Vehicle* rear;\r\n    Vehicle* passedLog;\r\n\r\npublic:\r\n    TrafficQueue() : front(nullptr), rear(nullptr), passedLog(nullptr) {}\r\n\r\n    void arriveVehicle(const string&amp; number) \r\n    {\r\n        Vehicle* temp = new Vehicle(number);\r\n        if (rear==nullptr) \r\n        {\r\n            front = rear = temp;\r\n        } \r\n        else \r\n        {\r\n            rear-&gt;next = temp;\r\n            rear = temp;\r\n        }\r\n        cout &lt;&lt; \"\\n Vehicle \" &lt;&lt; number &lt;&lt; \" arrived at the signal.\" &lt;&lt; endl;\r\n    }\r\n\r\n    void logPassedVehicle(const string&amp; number) \r\n    {\r\n        Vehicle* temp = new Vehicle(number);\r\n        if (passedLog==nullptr) \r\n        {\r\n            passedLog = temp;\r\n        } else \r\n        {\r\n            Vehicle* ptr = passedLog;\r\n            while (ptr-&gt;next)\r\n                ptr = ptr-&gt;next;\r\n            ptr-&gt;next = temp;\r\n        }\r\n    }\r\n\r\n    void passVehicle() \r\n    {\r\n        if (front==nullptr) \r\n        {\r\n            cout &lt;&lt; \"\\nNo vehicles waiting at the signal.\" &lt;&lt; endl;\r\n            return;\r\n        }\r\n        Vehicle* temp = front;\r\n        cout &lt;&lt; \"\\nVehicle \" &lt;&lt; temp-&gt;number &lt;&lt; \" passed the signal.\" &lt;&lt; endl;\r\n        logPassedVehicle(temp-&gt;number);\r\n        front = front-&gt;next;\r\n        if (front==nullptr) \r\n        rear = nullptr;\r\n\r\n        delete temp;\r\n    }\r\n\r\n    void displayQueue() \r\n    {\r\n       if (front==nullptr) \r\n        {\r\n            cout &lt;&lt; \"\\n No vehicles in the queue.\" &lt;&lt; endl;\r\n            return;\r\n        }\r\n        cout &lt;&lt; \"\\n Vehicles at signal:\" &lt;&lt; endl;\r\n        Vehicle* temp = front;\r\n        while (temp!=nullptr)\r\n        {\r\n            cout &lt;&lt; \"  -&gt; \" &lt;&lt; temp-&gt;number &lt;&lt; endl;\r\n            temp = temp-&gt;next;\r\n        }\r\n    }\r\n\r\n    void countQueue() \r\n    {\r\n        int count = 0;\r\n        Vehicle* temp = front;\r\n        while (temp) \r\n        {\r\n            count++;\r\n            temp = temp-&gt;next;\r\n        }\r\n        cout &lt;&lt; \"\\nTotal vehicles waiting: \" &lt;&lt; count &lt;&lt; endl;\r\n    }\r\n\r\n    void clearQueue() \r\n    {\r\n        while (front!=nullptr) \r\n        {\r\n            Vehicle* temp = front;\r\n            front = front-&gt;next;\r\n            delete temp;\r\n        }\r\n        rear = nullptr;\r\n        cout &lt;&lt; \"\\n All vehicles cleared from the signal!\" &lt;&lt; endl;\r\n    }\r\n\r\n    void searchVehicle(const string&amp; number) \r\n    {\r\n\r\n        Vehicle* temp = front;\r\n        while (temp!=nullptr)\r\n         {\r\n            if (temp-&gt;number == number) \r\n            {\r\n                cout &lt;&lt; \"\\n Vehicle \" &lt;&lt; number &lt;&lt; \" is currently in the queue.\" &lt;&lt; endl;\r\n                return;\r\n            }\r\n            temp = temp-&gt;next;\r\n        }\r\n        cout &lt;&lt; \"\\n Vehicle \" &lt;&lt; number &lt;&lt; \" not found in queue.\" &lt;&lt; endl;\r\n    }\r\n\r\n    void showFirstAndLast() \r\n    {\r\n        if (front==nullptr) \r\n        {\r\n            cout &lt;&lt; \"\\nNo vehicles in the queue.\" &lt;&lt; endl;\r\n            return;\r\n        }\r\n        cout &lt;&lt; \"\\nFirst Vehicle: \" &lt;&lt; front-&gt;number &lt;&lt; endl;\r\n        cout &lt;&lt; \"Last Vehicle: \" &lt;&lt; rear-&gt;number &lt;&lt; endl;\r\n    }\r\n\r\n    void showPassedLog() \r\n    {\r\n        if (passedLog==nullptr) \r\n        {\r\n            cout &lt;&lt; \"\\nNo vehicles have passed the signal yet.\" &lt;&lt; endl;\r\n            return;\r\n        }\r\n        cout &lt;&lt; \"\\nPassed Vehicles Log:\" &lt;&lt; endl;\r\n        Vehicle* temp = passedLog;\r\n        while (temp!=nullptr) \r\n        {\r\n            cout &lt;&lt; \"  -&gt; \" &lt;&lt; temp-&gt;number &lt;&lt; endl;\r\n            temp = temp-&gt;next;\r\n        }\r\n    }\r\n};\r\n\r\nvoid menu() \r\n{\r\n    TrafficQueue tq;\r\n    int choice;\r\n    string number;\r\n\r\n    do \r\n    {\r\n        cout &lt;&lt; \"\\n========== Traffic Light Simulation ==========\";\r\n        cout &lt;&lt; \"\\n1. Vehicle Arrives\";\r\n        cout &lt;&lt; \"\\n2. Signal Turns Green (Vehicle Passes)\";\r\n        cout &lt;&lt; \"\\n3. Show Vehicles in Queue\";\r\n        cout &lt;&lt; \"\\n4. Count Waiting Vehicles\";\r\n        cout &lt;&lt; \"\\n5. Emergency Clear All Vehicles\";\r\n        cout &lt;&lt; \"\\n6. Search Vehicle by Number\";\r\n        cout &lt;&lt; \"\\n7. Show First and Last Vehicle\";\r\n        cout &lt;&lt; \"\\n8. Show Passed Vehicle Log\";\r\n        cout &lt;&lt; \"\\n9. Exit\\n\";\r\n        cout &lt;&lt; \"Choose an option: \";\r\n        cin &gt;&gt; choice;\r\n        cin.ignore();\r\n\r\n        switch (choice) \r\n        {\r\n            case 1:\r\n                cout &lt;&lt; \"Enter vehicle number: \";\r\n                getline(cin, number);\r\n                tq.arriveVehicle(number);\r\n                break;\r\n            case 2:\r\n                tq.passVehicle();\r\n                break;\r\n            case 3:\r\n                tq.displayQueue();\r\n                break;\r\n            case 4:\r\n                tq.countQueue();\r\n                break;\r\n            case 5:\r\n                tq.clearQueue();\r\n                break;\r\n            case 6:\r\n           if (tq.front==nullptr) \r\n           {\r\n            cout &lt;&lt; \"\\nNo vehicles in the queue.\" &lt;&lt; endl;\r\n           }\r\n           else\r\n           {\r\n                cout &lt;&lt; \"Enter vehicle number to search: \";\r\n                getline(cin, number);\r\n                tq.searchVehicle(number);\r\n           }    \r\n                break;\r\n            case 7:\r\n                tq.showFirstAndLast();\r\n                break;\r\n            case 8:\r\n                tq.showPassedLog();\r\n                break;\r\n            case 9:\r\n                cout &lt;&lt; \"\\n Exiting simulation. Goodbye!\" &lt;&lt; endl;\r\n                break;\r\n            default:\r\n                cout &lt;&lt; \"\\n Invalid option. Try again.\" &lt;&lt; endl;\r\n        }\r\n    } while (choice != 9);\r\n}\r\n\r\nint main() \r\n{\r\n    menu();\r\n    return 0;\r\n}<\/pre>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Program 1 \/\/ Project: Traffic Light Simulation Using Queue Linked List \/\/&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;- \/\/ Features: \/\/ Add vehicles to queue (simulating arrival) \/\/ Process vehicles when the signal turns green \/\/ Show vehicles in the&#46;&#46;&#46;<\/p>\n","protected":false},"author":581,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[31449],"tags":[32874,32869,32870,34887,34949,34813,34947,34866,34948],"class_list":["post-146077","post","type-post","status-publish","format-standard","hentry","category-dsa-cpp-tutorials","tag-dsa-c","tag-dsa-c-practical","tag-dsa-c-program","tag-dsa-c-project","tag-dsa-c-traffic-light-simulation-project","tag-traffic-light-simulation","tag-traffic-light-simulation-in-dsa-c","tag-traffic-light-simulation-project","tag-traffic-light-simulation-using-dsa-c"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>DSA C++ Project - Traffic Light Simulation - DataFlair<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/data-flair.training\/blogs\/traffic-light-simulation-in-dsa-cpp\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"DSA C++ Project - Traffic Light Simulation - DataFlair\" \/>\n<meta property=\"og:description\" content=\"Program 1 \/\/ Project: Traffic Light Simulation Using Queue Linked List \/\/---------------------------------------------------------- \/\/ Features: \/\/ Add vehicles to queue (simulating arrival) \/\/ Process vehicles when the signal turns green \/\/ Show vehicles in the&#046;&#046;&#046;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/data-flair.training\/blogs\/traffic-light-simulation-in-dsa-cpp\/\" \/>\n<meta property=\"og:site_name\" content=\"DataFlair\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/DataFlairWS\/\" \/>\n<meta property=\"article:published_time\" content=\"2025-07-23T06:01:31+00:00\" \/>\n<meta name=\"author\" content=\"DataFlair Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@DataFlairWS\" \/>\n<meta name=\"twitter:site\" content=\"@DataFlairWS\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"DataFlair Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"DSA C++ Project - Traffic Light Simulation - DataFlair","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/data-flair.training\/blogs\/traffic-light-simulation-in-dsa-cpp\/","og_locale":"en_US","og_type":"article","og_title":"DSA C++ Project - Traffic Light Simulation - DataFlair","og_description":"Program 1 \/\/ Project: Traffic Light Simulation Using Queue Linked List \/\/---------------------------------------------------------- \/\/ Features: \/\/ Add vehicles to queue (simulating arrival) \/\/ Process vehicles when the signal turns green \/\/ Show vehicles in the&#46;&#46;&#46;","og_url":"https:\/\/data-flair.training\/blogs\/traffic-light-simulation-in-dsa-cpp\/","og_site_name":"DataFlair","article_publisher":"https:\/\/www.facebook.com\/DataFlairWS\/","article_published_time":"2025-07-23T06:01:31+00:00","author":"DataFlair Team","twitter_card":"summary_large_image","twitter_creator":"@DataFlairWS","twitter_site":"@DataFlairWS","twitter_misc":{"Written by":"DataFlair Team","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/data-flair.training\/blogs\/traffic-light-simulation-in-dsa-cpp\/#article","isPartOf":{"@id":"https:\/\/data-flair.training\/blogs\/traffic-light-simulation-in-dsa-cpp\/"},"author":{"name":"DataFlair Team","@id":"https:\/\/data-flair.training\/blogs\/#\/schema\/person\/c187795dc82ab948373cca526df7c445"},"headline":"DSA C++ Project &#8211; 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