As an "old snail" in the maintenance industry for 20 years, young people have been asking about the BMW-marked variable-speed mountain bike recently - the ruthlessness of the pair of disc brakes biting the ground, the sense of technology revealed by the magnesium alloy wheels, and the smooth switching of the transmission system have indeed subverted many people's traditional understanding of bicycles. Today, let's take apart the mechanical bones of this "Urban Explorer" and take a look at the precision mechanisms hidden under the cool appearance.

Traffic safety relationship Thousands of households improve their self-awareness of traffic safety and develop civilized traffic behavior. Obeying traffic rules is not only related to the safety of their own lives and property, but also a manifestation of respecting the lives of others. Always keep in mind traffic laws. Abiding by traffic rules starts with yourself and starts with small things. Let "Ping An Avenue" flow unimpeded and consciously abide by traffic rules. Where there are traffic lights, stop at red lights and do not use scooters, roller skates, balance cars, and other means of transportation on the road. Do not play and play on the side of the road, at the entrance and exit of motor vehicles on the road, or in the blind spot of vehicles

The reasons for the fire of electric vehicles are very complicated. The aging of their own wiring, short circuit of the battery, mismatch of the charger, and overcharging may all cause the fire. Comparatively speaking, the risk of electric vehicles is the greatest when charging. Different models of electric vehicles need to be equipped with different electric vehicle chargers and cannot be mixed. Inferior chargers and mismatched chargers are all fire hazards.

Our country is a big bicycle country, but there is still a lot of room for improvement in the technology of corresponding management facilities, especially in general, bicycles are classified as non-motor vehicles at the legal level, and classified as slow traffic in technical classification, which brings many problems to the use of bicycles and road design, which in turn affects the order of road traffic and destroys the fluency and safety of traffic flow. The author draws on the technical materials of Western countries, sorts out some knowledge points worth thinking about, and re-examines the countermeasures for designing bicycle lanes and electric bicycle lanes.

Bicycles should be followed one by one, and there can be deviations in the front-to-back alignment queue. The deviation distance is generally 20-80 cm. It is not a swarm of people chasing each other forward in a wide lane. Especially at intersections, it is necessary to be able to let others predict the trajectory of each bicycle. Because as long as there is a dynamic traffic flow and the movement has a continuous speed, the difference in behavior between people will be amplified by speed, and people's judgment ability and ability to deal with danger will be challenged. Interactions between people must be advanced, and traffic control measures must be used to prompt, control and actively guide.

The basic profile of a cyclist, as commonly defined in Western countries, requires 1.0 meters (40 inches) of basic operating space (including the space required for the handlebars and front wheels to twist). Under normal circumstances, the United States defines 1.2 meters (4 feet) of operating space as the minimum effective width of any bicycle lane or lane preferred by cyclists, whether hard shoulder or dedicated bicycle lane. If there is a large flow of motor vehicles, high speed of motor vehicles or bicycles, and mixed traffic of large trucks and buses increases.

The choice of bicycle lanes depends on many factors, including the ability of road users, specific corridor conditions, and facility costs. User capacity refers not only to skills, but also physical conditions, time, and other conditions. Many developed countries classify bicycle lanes differently, but the basic logic is the same, that is, according to the purpose of use, right of way, technical conditions, and facility level. The following describes the classification of bicycle lanes in the United States.

The bicycle path guide sign on the shared road is of great significance, not only to indicate the destination, but also to prompt the rider. Compared with other paths, this path has specific conditions that are more conducive to riding. At the same time, it tells the road user that the road management has done special work for riding on the road to ensure that it is more suitable for the use of motor vehicles and bicycles. On the other hand, it also reminds the motorists who pass by that there are cyclists on the road.