<Tr> <Td> Sweden (1990) </Td> <Td> 110 km / h to 90 km / h </Td> <Td> Speeds declined by 14 km / h Fatal crashes declined by 21% </Td> </Tr> <Tr> <Td> Switzerland (1994) </Td> <Td> 130 km / h to 120 km / h </Td> <Td> Speeds declined by 5 km / h Fatal crashes declined by 12% </Td> </Tr> <Tr> <Td> UK (1991) </Td> <Td> 60 mph to 40 mph / 100 km / h to 65 km / h </Td> <Td> Speeds declined by 6 km / h (4 mph) Crashes declined by 14% </Td> </Tr> <Tr> <Td> US (22 states) (1992) </Td> <Td> 5 mph to 15 mph (8 km / h to 24 km / h) decreases </Td> <Td> No significant changes </Td> </Tr>

List the possible consequences of rolling at a. too high speed b. too low speed