asked the Secretary of State for Transport how many conversions from large to mini roundabouts at road junctions have been introduced in Essex on roads for which he is responsible; and how many of the increased accidents relate to these conversions.
Two sites on the A12 in Essex were converted from large to mini roundabouts during 1972. The stretch of A12 road concerned was detrunked in December 1974 and is now the responsibility of the Essex County Council.The following information has been extracted from the recent report—LR 774—published by the Transport and Road Research Laboratory:
| INJURY ACCIDENTS DURING THE PERIOD AFTER CONVERSION TO MINI-ROUNDABOUTS | ||
| Actual | Expected* | |
| COLCHESTER | ||
| A12/A134 (August 1972-December 1974) | 43 | 14 |
| COLCHESTER | ||
| A12/A133 (July 1971-December 1974) | 15 | 18 |
| * Estimated from relevant national trends in numbers of accidents over the same periods. | ||
asked the Secretary of State for Transport if he will list in the Official Report details of the number of accidents and the number and percentage of fatal accidents at road junctions where conversions have taken place from large to mini roundabouts.
The following information has been extracted from the recent report—LR 774—published by the Transport
| INJURY ACCIDENTS IN 30–40 MILES PER HOUR SPEED LIMIT AREAS AT JUNCTIONS CONVERTED FROM A LARGE ROUNDABOUT TO A MINI-ROUNDABOUT (ENGLAND AND WALES) | ||||||||||
| Number of sites | Number of accidents after conversion* | |||||||||
| Actual | Expected† | |||||||||
| Fatal or serious accidents‡ | … | … | … | … | 25 | 73 | 24 | |||
| All injury§ | … | … | … | … | … | … | … | 26 | 296 | 155 |
| * The individual sites were modified at a number of different dates between 1970 and 1974. The total accidents shown here cover a variety of periods of time. | ||||||||||
| † Estimated from relevant national trends in numbers of accidents over the same periods. | ||||||||||
| ‡ Excludes 3-arm junctions but includes two multiple island junctions. | ||||||||||
| § Excludes 3-arm junctions but includes three multiple island junctions. | ||||||||||