 In and around town, both day and night are punctured by the sounds of bike engines gunned and revved at stop lights and in parkings lots, while groups of cycle riders dominate the streets.
<coherence>  In and around town, both day and night are punctured by the sounds of bike engines gunned and revved at stop lights and in parkings lots, while groups of cycle riders dominate the streets.
 In and around town, both day and night are punctured by the sounds of bike engines gunned and revved at stop lights and in parking lots. Groups of cycle riders dominate the streets.