我想問如果危駕罪成會吾會有案底同攞吾攞到良民証？

The answer of both questions is yes, as the violation, if convicted, can carry a sentence of imprisonment.

Dangerous driving is not usually a standalone charge. In order to prove your driving is dangerous in nature, additional traffic offense(s) will usually charged at the same time. For example, driving in excessive speed (speeding and dangerous driving).

In your case, your chance for careless driving depends if the nature of the case, which at the minimum, if you are charged with any additional offenses or not. If not, your chance (for a lower charge) will be higher.

其實冇碰撞，只係cut 線巴士急殺話有人傷，如請律師可以要求改控不小心駕駛嗎？

危險駕駛引是一項交通意外的司機有機會被指控的刑事罪名，如罪名成會留刑事記錄，是不會獲發良民證的。