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Instead of driving a car or taking public transportation, many commuters ride their bicycles to work. This is more environmentally friendly than driving and takes up less space in crowded cities. However, there are significant problems with safety on the roads when cyclists commute.



First, a major problem involves traffic signals. Most road and traffic systems are designed for cars, not bicycles, and so the intervals at which traffic signals are placed are established with cars in mind; for this reason, cyclists typically encounter many more red signals than cars do during their commute. Having to stop at so many red signals is frustrating and stressful for cyclists. Perhaps because of this, cyclists are significantly more likely to go through red signals without stopping than cars are, putting themselves and others at great risk of collision.



Second, commuting to work by bicycle often requires strenuous exercise. If cyclists regularly experience fatigue due to strenuous exercise, they will be tired during their commute to and from work. This tiredness may make them less attentive and less alert to what is happening around them. This in turn may increase the likelihood that these cyclists will be involved in accidents on the road.



Third, because many cyclists need to commute at times when there is no sunlight, they place themselves and others at risk as they light their way. When it is too dark for drivers in cars to see cyclists, or for cyclists to see the road in front of them, the cyclists often attach bright lamps to their bicycles. These lamps, which point forward so the cyclist can see as much of the road as possible, are often designed to flash, with intermittent pulses of light; although this may seem like an effective way for cyclists to alert others to their presence, those flashes of light can be very distracting to other cyclists and drivers and could cause accidents

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Fortunately, the problems you read about can all be solved. First, one major city has a solution for bicycles getting stuck at red lights. The city puts special speed limits on a few small one way streets that cars and cyclists use. If you travel at that speed on a bicycle, the traffic signals will turn green just as you reach each intersection. That's because the traffic signals are specially timed. Cyclists may encounter one red signal, but after that they can pass through many green signals without stopping, so cyclists will be less likely to go through red signals without stopping when they do encounter them. Second, those who are concerned about the alertness of cyclists need not be you see, commuting by bicycle may actually improve people's quality of sleep. Exercise, such as cycling, makes your body temperature rise. It remains elevated for five to six hours after you stop exercising, when your temperature finally turns to normal, you start feeling tired, which can sleep well. So for people who bicycle home from work about five to six hours before their bedtime, their body temperature will return to normal just in time to go to sleep. They will sleep well, and as a result, they may be more alert on the road the next day. Third, there's a way to keep cyclists safe without the use of those bright lamps on their bicycles. It involves the use of motion activated lights, which can be attached to light posts along the side of a road. These motion activated lights are programmed to detect when a cyclist is arriving. When these lights detect a cyclist, they temporarily shine very brightly. But unlike the lamps on bicycles, these lights do not flash or pulse. This is not nearly as distracting to approaching cars or bikes as a flashing or pulsing lamp would be.
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Summarize the points made in the lecture, being sure to explain the specific problems mentioned in the reading passage.

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