You can post two tickets a day, but only for different illegal acts. For example, after posting a ticket in this place, you can't be punished for the second time in this place, but you can be punished again in another place after posting a ticket.

legal ground

Article 24 of the Administrative Punishment Law

For the same illegal act of a party, no administrative penalty of more than two fines shall be imposed.

Article 90 of the Road Traffic Safety Law

Motor vehicle drivers who violate the provisions of laws and regulations on road traffic safety shall be given a warning or fined from 20 yuan to 200 yuan. If there are other provisions in this law, it shall be punished in accordance with its provisions.