<![CDATA[AbstractVehicle speeding violations are one of the major contributors to traffic accidents, while the implementation of Electronic Traffic Law Enforcement (ETLE) systems remains limited due to their relatively high infrastructure and operational costs. This study aims to design, implement, and evaluate an Internet of Things (IoT)-based prototype for vehicle speeding violation detection capable of providing real-time monitoring and notifications. The research employed the prototyping method, which consists of requirements identification, system design, prototype development, system testing, and result analysis. The proposed system utilizes an ESP32 microcontroller as the main controller, two HC-SR04 ultrasonic sensors to detect vehicles and calculate their speed based on travel time differences, a Logitech C270 webcam to capture vehicle images, and the Blynk platform for monitoring and notification services. The experimental results demonstrate that the system successfully detects vehicles, calculates their speed, determines violation status, displays violation information on the Blynk dashboard, and automatically sends notifications to officers. Performance evaluation indicates an accuracy of 91%, a 100% vehicle detection success rate, an average response time of 0.4 seconds, and 100% system stability. These results demonstrate that the developed prototype is capable of performing the primary functions of an IoT-based vehicle speeding violation detection system in accordance with the proposed design. Keyword: Internet of Things; prototyping; speed violation detection; traffic monitoring system; ultrasonic sensorAbstrakPelanggaran batas kecepatan kendaraan merupakan salah satu penyebab tingginya angka kecelakaan lalu lintas, sementara implementasi sistem Electronic Traffic Law Enforcement (ETLE) belum merata karena membutuhkan biaya dan infrastruktur yang relatif tinggi. Penelitian ini bertujuan merancang, mengimplementasikan, dan mengevaluasi prototype sistem deteksi pelanggaran kecepatan kendaraan berbasis Internet of Things (IoT) yang mampu melakukan pemantauan dan pengiriman notifikasi secara real-time. Metode penelitian yang digunakan adalah prototyping, yang meliputi identifikasi kebutuhan, perancangan sistem, pembangunan prototype, pengujian sistem, dan analisis hasil. Sistem dikembangkan menggunakan mikrokontroler ESP32 sebagai pengendali utama, dua sensor ultrasonik HC-SR04 untuk mendeteksi kendaraan dan menghitung kecepatan berdasarkan selisih waktu tempuh, webcam Logitech C270 untuk mengambil gambar kendaraan, serta platform Blynk sebagai media monitoring dan notifikasi. Hasil pengujian menunjukkan bahwa sistem mampu mendeteksi kendaraan, menghitung kecepatan, menentukan status pelanggaran, menampilkan informasi pelanggaran pada dashboard Blynk, serta mengirimkan notifikasi secara otomatis kepada petugas. Pengujian kinerja menghasilkan tingkat akurasi sebesar 91%, tingkat keberhasilan deteksi 100%, rata-rata waktu respons 0,4 detik, dan tingkat stabilitas sistem 100%, sehingga prototype yang dikembangkan mampu menjalankan fungsi utama deteksi pelanggaran kecepatan kendaraan berbasis IoT sesuai dengan rancangan sistem.Kata Kunci: deteksi pelanggaran kecepatan; Internet of Things; prototyping; sistem pemantauan lalu lintas; ultrasonik]]>
