题目内容
（请给出正确答案）
In Britain, the old Road Traffic Act restricted speeds to 2 m.p.h. in towns and 4 m.p.h.
Speeding is now the most common motoring offence in Britain. Offences for speeding fall into three classes: exceeding the limit on a restricted road, exceeding on any road the
limit for the vehicle you are driving, and exceeding the 70 m.p.h. limit on any road. A restricted road is one where the street lamps are 200 yards apart, or more.
The main controversy surrounding speeding laws is the extent of their safety value. The Ministry of Transport maintains that speed limits reduce accidents. It claims that when the 30 m.p.h. limit was introduced in 1935 there was a fall of 15 percent in fatal accidents. Likewise, when the 40 m.p.h. speed limit was imposed on a number of roads in London in the late fifties, there was a 28 percent reduction in serious accidents. There were also fewer casualties in the year after the 70 m.p.h. motorway limit was imposed in 1966.
In America, however, it is thought that the reduced accident figures are due rather to the increase in traffic density. This is why it has even been suggested that the present speed limits should be done away with completely, or that a guide should be given to inexperienced drivers and the speed limits made advisory, as is done in parts of the USA.
Questions:
1. During which period could British motorists drive without speed limits？
2. What measures were adopted in 1935 in addition to the speeding restrictions？
3. Speeding is a motoring offence a driver commits when he ________.
4. What is the opinion of British authorities concerning speeding laws？
5. What reason do Americans give for the reduction in traffic accidents？
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