Careless driving和Reckless driving均有在驾驶机动车过程中没有尽到应有的注意和小心的含义。

Careless driving：Driving a vehicle on a highway without due care and attention or without reasonable consideration for other person using the highway，仅为一种较轻微的过失，故为“疏忽驾驶”。

Reckless driving：The criminal offense of operating a motor vehicle in a manner that shows conscious indifference to the safety of others，则较严重，可能对他人生命、安全或权利造成实质性和不公正的危险，且有时还带故意和放肆，其为一种刑事犯罪，故为“莽撞驾驶机动车辆罪”。

参考双语例句：

①Upon our enquiry, the Administration has confirmed that these amendments are intended to cover cases where a person is charged with one offence but is subsequently convicted of another related offence; for example, the Amendment Rules are intended to allow legal aid to be granted to a person charged with dangerous driving but convicted of careless driving if the person makes an appeal against the conviction of careless driving.

就该罪行向终审法院上诉而申请许可；及应本部的查询，政府当局确认上述修订的原意是涵盖某人被控某项罪行但其后被判另一项相关罪行罪名成立的情况；举例而言，某人被控一项危险驾驶罪行但其后被判不小心驾驶罪名成立，若该人就其不小心驾驶定罪提出上诉，当局的原意是修订规则会容许该人获得法律援助。

②We know that the main causes of traffic accidents are associated with speeding, reckless or drunk driving, mechanical failures, lack of caution on the part of pedestrians, poorly maintained road surfaces and the lack of signs and signals, among other things.

我们知道，交通事故的主要原因与超速行驶、鲁莽驾驶或酒后驾车、机械故障、行人不够谨慎、路面养护状况不良以及缺少路牌和信号灯等原因有关。