Each car has 4 tires, so 15 cars x 4 tires = 60 car tires.
Each bicycle has 2 tires, so 3 bicycles x 2 tires = 6 bicycle tires.
Each pickup truck has 4 tires, so 8 pickup trucks x 4 tires = 32 pickup truck tires.
The tricycle has 3 tires, so 1 tricycle x 3 tires = 3 tricycle tires.
In total, there are 60 car tires + 6 bicycle tires + 32 pickup truck tires + 3 tricycle tires = 101 tires.
#### 101
The answer is: 101
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
After school, Juan observed various types of transportation on his way home, including 15 cars, 3 bicycles, 8 pickup trucks, and 1 tricycle. How many tires were there in total on the vehicles Juan saw?

### Answer:
