To solve this problem, we need to calculate how many students travel to school by foot and by car, then find the difference between these two quantities.

From the survey data, we have the following fractions for each mode of transportation:

• By car: $\frac{1}{4}$
• By foot: $\frac{1}{2}$

The total number of students who responded to the survey is 148.

Now, calculate the number of students using each mode of transportation:

• Number of students traveling by car: $\frac{1}{4} \times 148$
• Number of students traveling by foot: $\frac{1}{2} \times 148$

Let's compute these values.