| Index- Mark. Locale. | |
| AI | Co. Meath |
| BI | Co. Monaghan |
| CI | Queen’s County |
| DI | Co. Roscommon |
| EI | Co. Sligo |
| FI | Tipperary, North |
| HI | Tipperary, South |
| IA | Co. Antrim |
| IB | Co. Armagh |
| IC | Co. Carlow |
| ID | Co. Cavan |
| IE | Co. Clare |
| IF | Co. Cork |
| IH | Co. Donegal |
| IJ | Co. Down |
| IK | Co. Dublin |
| IL | Co. Fermanagh |
| IM | Co. Galway |
| IN | Co. Kerry |
| IO | Co. Kildare |
| IP | Co. Kilkenny |
| IR | King’s County |
| IT | Co. Leitrim |
| IU | Co. Limerick |
| IW | Co. Londonderry |
| IX | Co. Longford |
| IY | Co. Louth |
| IZ | Co. Mayo |
| JI | Co. Tyrone |
| KI | Co. Waterford |
| LI | Co. West Meath |
| MI | Co. Wexford |
| NI | Co. Wicklow |
| OI | Belfast |
| PI | Cork |
| RI | Dublin |
| TI | Limerick |
| UI | Londonderry |
| WI | Waterford |
FRANCE
In France the index-numbers are divided among sixteen sections, including Algeria, which are called Arrondissements minéralogiques. Some of these sections contain as many as eight departments or counties. The majority have single letters. Paris has five sets of single letters. It is necessary for a motoriste from the United Kingdom, when taking her car into France, to affix a French index-mark above her British one. This mark and number will be given her at the point of debarkation on registering the car and on passing a pleasant and easy little examination in the art of driving. This test consists in driving round a square or up and down the street for about a quarter or half a mile, turning a few corners en route. The French index-marks are as follows:
GERMANY
The motoriste from the United Kingdom can take her car into Germany and drive it there without having to put on a new number. Germany willingly accepts the British index-mark already on the car. Index-marks in Germany are allotted in twenty-six different sections, one of which, Prussia, is sub-divided into twelve provinces and the city of Berlin. In nearly all the distinct kingdoms and duchies an attempt has been made to utilise the initial letter of that section, thereby making recognition of the locale of the car quicker.
In Prussia the mark is the number I in a Roman figure followed by letters of the alphabet. In many other provinces numbers in Roman figures are also used, the figure in most instances being followed by a letter of the alphabet.
The following are the German police index-marks for cars (Kraftfahrzeuge):