divides into several different parts

devices that slow down a car

pauses during the day

signs of damage

There are still driving challenges that people are trying to solve.

City officials were busy repairing old roads.

New driving rules were very difficult to follow.

The use of signals improved driving safety in cities.

a lack of effort

a lack of money

a lack of interest

a lack of cooperation

by completing the interstate highway system

by organizing the roads into an orderly system

by developing some of the earliest traffic signals

by encouraging people to buy faster cars

Newer highways were divided into odd- and even-numbered routes.

There are still driving challenges that people are trying to solve.

The earliest cars were simpler and much easier to drive.

It took a lot of time and effort to establish safe driving rules and highways.

without danger

prevented by driving

full of danger

assisted by driving