When you are out riding, don't ride in the gutter. That's where all the grit is and you'll quickly gets punctures, aim to ride about 6 inches away from the kerb. One you won't get as many punctures. Two it's also safer, car drivers rather than trying to a squeeze past you on a narrow section of road will wait until the road is wider to pass.
JODRELL BANK CYCLOSPORTIVE 2011