I've always thought of that too, "well the other one is due to go soon now" usually replace em both, leave the old but good one for a spare, sometimes, I just keep a spare set of new besides replacing them, they stay in and with that vehicle, including spares for tail lights. It's hard to say when that filament is going to break, the on/off cycle and vibration eventually does em in, I think, my theory, could be wrong. Usually at an inopportune time too. My rationale is law enforcement, in the past few years they are relentless, anything wrong, the slightest deficiency, a light out, is guaranteed to get you pulled over around here. They don't care if it just went out, now whether you get cited for it is a different thing. Always be friendly and have your license, registration and insurance card in hand by the time he/she gets to your window, I keep them at arms lenght when in any vehicle, bugs me if I don't know where they are. I check my vehicles constantly, and have always done that. Has always buggged me when I find a light out, must get immediately taken care of, but with the recent attention by law enforcement, it's a good practice to check often and have spares. Just one of those silly things that can save you a hassle, and is a safety concern that could haunt you if an accident were to happen. Even then, darned thing will go out and it's the luck of the draw. Was out late one night in January, worked a long day, decided to go out and meet my lady friend for dinner, and listen to the live music. On the way home, got pulled over for a brake light out, had spares with me, changed it on the spot in front of the officer. He was super cool, very polite, I appreciated that, but nonetheless, when you least expect it, they burn out and you're stuck unless you a spare.
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