Somebody contacted me from Londo and told me this. He was using a cargo trike in London to do deliveries. He bought it from a reputable company, and it was plated as 250w, running 48v (I think) at 15amps. It had a 6km/hr throttle fitted. Top speed slightly under 15 mph because of the low motor gearing.
The police stopped him, looked over his bike and decided that it looked too powerful, so they took it back to the station, put one of those clamp type current measuring devices around the battery wires, and opened the throttle. With the motor more or less stalled, they calculated 600w from the battery, which they thought was its output power, so they impounded it and said that it was going to be destroyed. Naturally, the guy was very upset because not only was he going to lose his very expensive trike, but he was also going to lose his income from all the Xmas deliveries. He got a letter from the manufacturer of the trike, that said that it was legal and rated at 250w, but said that they had measured more than 250w, so they disregarded it.
I wrote him a letter explaining that the ploice had used an invalid method to determine the output power and that they had applied the wrong standard, as the law applies to only the continuous rated power, not the output power. There were details in the letter to substantiate those statements.
Now the happy ending. He gave the letter to the police. Not long afterwards, they returned his bike and appologised for what they had done.
Hopefully, they won't be doing that again.
It's virtually impossible to test a vehicle to dertermine its continuous rated power or whether it's power is legal, but what you must have is a label or plate on the bike that indicates its maximum speed and rated power.
The police stopped him, looked over his bike and decided that it looked too powerful, so they took it back to the station, put one of those clamp type current measuring devices around the battery wires, and opened the throttle. With the motor more or less stalled, they calculated 600w from the battery, which they thought was its output power, so they impounded it and said that it was going to be destroyed. Naturally, the guy was very upset because not only was he going to lose his very expensive trike, but he was also going to lose his income from all the Xmas deliveries. He got a letter from the manufacturer of the trike, that said that it was legal and rated at 250w, but said that they had measured more than 250w, so they disregarded it.
I wrote him a letter explaining that the ploice had used an invalid method to determine the output power and that they had applied the wrong standard, as the law applies to only the continuous rated power, not the output power. There were details in the letter to substantiate those statements.
Now the happy ending. He gave the letter to the police. Not long afterwards, they returned his bike and appologised for what they had done.
Hopefully, they won't be doing that again.
It's virtually impossible to test a vehicle to dertermine its continuous rated power or whether it's power is legal, but what you must have is a label or plate on the bike that indicates its maximum speed and rated power.