![]() As a bonus, this method directly displays the countdown register's contents on the LCD without requiring current-hungry binary-to-BCD conversions. ![]() For example, 21+99=120 dropping the one in the 100s place yields a value of 20. Adding a value of 99 (decimal) to the countdown register and discarding the leftmost digit perform a one-digit subtraction. The interrupt awakens the processor, which executes an active main-software loop that decrements a countdown register via direct BCD (binary-coded-decimal) subtraction. Initially hailed as successful tools, these timers have become problematic due to technical (function() ) In normal (standby) operation, the microprocessor's 32-kHz external-crystal clock drives an internal counter that generates an interrupt once per second. Faulty CDTs pose a challenge for drivers who are unable to accurately gauge the waiting time at traffic signals, particularly during peak hours.ĬDT timers are digital clocks that display the remaining time for the current stoplight indication-red, amber, or green. At many junctions, CDTs have been temporarily switched off due to various issues. However, they have become a source of frustration due to persistent technical glitches. CDTs are designed to facilitate smooth traffic flow, prevent accidents, and enhance pedestrian safety. HYDERABAD: Motorists in the city are facing increasing inconvenience, especially during peak hours, as numerous countdown timers (CDTs) installed at traffic signals are either malfunctioning or in dire need of upgrades. “The absence of timers makes it difficult for motorists and pedestrians to anticipate signal colour changes, making it challenging for them to respond appropriately,” said Ramesh, a concerned citizen. P Krishna from Balkampet highlighted the inconvenience caused by the nonfunctional CDTs at Begumpet. “However, due to the absence of CDTs at junctions like Paradise, many drivers are unable to turn off their engines, contributing to increased pollution,” he said. Venkatesh Kumar, a Tarnaka resident, said that the timers not only discourage signal jumping but also enable motorists to save fuel by switching off their engines. Meanwhile, citizens expressed the benefits of countdown timers. ![]() GHMC officials acknowledged the significance of countdown timers in ensuring road safety and stated that plans for overhauling the timers are underway.Within the jurisdiction of the tri-police commissionerates of Hyderabad, Rachakonda, and Cyberabad, there are a total of 324 traffic signals and 78 pelican signals. ![]() Separate cables will need to be laid to synchronise the CDTs with the existing signal systems, while wireless timers will be affixed to the signals. Recognising the severity of the issue, the Greater Hyderabad Municipal Corporation (GHMC) has decided to upgrade and rewire the traffic signals in collaboration with specialised traffic signalling agencies and has invited bids to this effect. By providing clear timeframes, CDTs enable drivers to make informed decisions. Their purpose is to assist commuters who often find themselves in a quandary when deciding whether to proceed or halt at a yellow light before it turns red.
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