Vowel the vowel sounds of "flower", , form a triphthong or disyllable, depending on dialect. In phonology, diphthongs and triphthongs are distinguished from sequences of monophthongs by whether the vowel sound may be analyzed into different phonemes or not. For example, the vowel sounds in a two-syllable pronunciation of the word "flower" () phonetically form a disyllabic triphthong, but are phonologically a sequence of a diphthong (represented by the letters ) and a monophthong (represented by the letters ). Some linguists use the terms "diphthong" and "triphthong" only in this phonemic sense. The name "vowel" is often used for the symbols
Road collision types is often significantly worse because of the increased speeds involved. Because intersection collisions often result in side-impacts they are therefore often fatal because people are seated close to the part of the car that provides little protection. Although expensive to implement, roundabouts are an effective way of reducing the speed of traffic at intersections and dramatically reducing the likelihood of high speed right-angle collisions. Clear road markings and signing are low cost methods of improving safety at intersections. Road collision types Road traffic collisions generally fall into one of four common types: Other types of collision may occur. Rollovers are