And overheated tires can explode as the riders circle counterclockwise (all traveling in one direction to avoid head-on collisions, Ariel said).
He dashed 81 yards for a score, and defenders tried to avoid head-on collisions on his way down the field.
Our study suggests that firms should not use strategic alliances merely to reduce R&D costs in a catch-up situation or to avoid head-on competition with rivals.
Because head-on collisions are more deleterious than codirectional collisions (Merrikh et al. 2012), genes should be preferentially encoded on the leading strand to avoid head-on collisions.
In bacteria, to avoid head-on collisions ribosomal operons (rrn) are transcribed in the direction of replication (Brewer, 1988; Rocha and Danchin, 2003).
The strong strand bias for genes may be selected for in order to avoid head-on collisions between replication forks and transcription machinery.
Because head-on collisions are more deleterious than codirectional collisions, genes should be preferentially encoded on the leading strand to avoid head-on collisions, as is observed in most bacterial genomes examined.
The strategic orientation of these genes has been explained as an advantage for efficient transcription, for example to avoid head-on collisions between the transcription and the replication machinery (Brewer et al., 1992; Mirkin et al., 2006).
The leading strand bias had therefore to be accounted for by physical constraints: transcription of key genes must avoid head-on collision with the replication machinery to prevent formation of truncated transcripts.
Additionally, participants were instructed to avoid head movements and to maintain gaze on the central fixation cross at all times.
